https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

Return to Cybersecurity terminology or Acronyms or List of computing and IT abbreviations

This is a list of computing and IT acronyms and IT abbreviations.

• Multi-factor authentication | 2FA—Two-factor authentication

• AAA protocol | AAA—Authentication Authorization, Accounting
• ACID—Atomicity Consistency Isolation Durability
• Acknowledge character | ACK—ACKnowledgement
• Access control list | ACL—Access Control List
• Advanced Configuration and Power Interface | ACPI—Advanced Configuration and Power Interface
• Active Directory | AD—Active Directory
• Administrative domain | AD—Administrative Domain
• Advanced Data Communication Control Procedures | ADCCP—Advanced Data Communications Control Procedures
• Advanced Encryption Standard | AES—Advanced Encryption Standard
• Anisotropic filtering | AF—Anisotropic Filtering
• Artificial intelligence | AI—Artificial Intelligence
• Access list | AL—Access List
• Access method | AM—Access Method
• American National Standards Institute | ANSI—American National Standards Institute
• Application Layer | APCI—Application-Layer Protocol Control Information
• Application programming interface | API—Application Programming Interface
• Zero configuration networking | APIPA—Automatic Private IP Addressing
• American Registry for Internet Numbers | ARIN—American Registry for Internet Numbers
• Address Resolution Protocol | ARP—Address Resolution Protocol
• .arpa | ARPA—Address and Routing Parameter Area
• Advanced Research Projects Agency | ARPA—Advanced Research Projects Agency
• Network access server | AS—Access Server
• AuthIP—Authenticated Internet Protocol
• Automated Security Enhancement Tool | ASET—Automated Security Enhancement Tool
• Application-specific integrated circuit | ASIC—Application-Specific Integrated Circuit
• Application service provider | ASP—Application Service Provider
• Access time | AT—Access Time
• Antivirus software | AV—Antivirus

• Block availability map | BAM—Block Availability Map
• Business Continuity | BC—Business Continuity
• Boot Configuration Data | BCD—Boot Configuration Data
• Byzantine fault tolerance | BFT—Byzantine Fault Tolerant
• Business intelligence | BI—Business Intelligence
• BIND—Berkeley Internet Name Domain
• Blog—Web Log
• Basic Multilingual Plane | BMP—Basic Multilingual Plane
• BNC connector | BNC—Bayonet Neill-Concelman
• Berkeley Open Infrastructure for Network Computing | BOINC—Berkeley Open Infrastructure for Network Computing
• Byte order mark | BOM—Byte Order Mark
• Bootstrap Protocol | BOOTP—Bootstrap Protocol
• BPDU—Bridge Protocol Data Unit
• Business Process Execution Language | BPEL—Business Process Execution Language
• Power line communication | BPL—Broadband over Power Lines
• Business Process Management | BPM—Business Process Management
• Business process modeling | BPM—Business Process Modeling
• bit rate | bps—bits per second
• Business reference model | BRM—Business Reference Model
• Business rule management system | BRMS—Business Rule Management System
• Business Readiness Rating | BRR—Business Readiness Rating
• Multichannel Multipoint Distribution Service | BRS—Broadband Radio Service
• Business Software Alliance | BSA—Business Software Alliance
• Back-side bus | BSB—Backside Bus
• Berkeley Software Distribution | BSD—Berkeley Software Distribution
• Blue Screen of Death | BSoD—Blue Screen of Death
• .bss | BSS—Block Started by Symbol
• BitTorrent (protocol) | BT—BitTorrent
• Bluetooth | BT—Bluetooth
• Basic telecommunications access method | B TAM—Basic Telecommunications Access Method
• Bandwidth (computing) | BW—Bandwidth
• Bring your own device | BYOD—Bring Your Own Device
• Byte—By eight (group of 8 bits)

• Computer architecture | CA—Computer Accountancy
• Computer-aided design | CAD—Computer-Aided Design
• Computer-aided engineering | CAE—Computer-Aided Engineering
• Computer-aided industrial design | CAID—Computer-Aided Industrial Design
• E-learning | CAI—Computer-Aided Instruction
• Computer-aided manufacturing | CAM—Computer-Aided Manufacturing
• CAPTCHA—Completely Automated Public Turing Test to tell Computers and Humans Apart
• Computer-assisted translation | CAT—Computer-Aided Translation
• Computer-aided quality | CAQ—Computer-Aided Quality Assurance
• Computer-aided software engineering | CASE—Computer-Aided Software Engineering
• GNU Compiler Collection | cc—C Compiler
• Compact Disc | CD—Compact Disc
• Common Desktop Environment | CDE—Common Desktop Environment
• Compact Disk File System | CDFS—Compact Disk File System
• Code division multiple access | CDMA—Code Division Multiple Access
• Content delivery network | CDN—Content Delivery Network
• Cisco Discovery Protocol | CDP—Cisco Discovery Protocol
• Continuous data protection | CDP—Continuous Data Protection
• CD-R—CD-Recordable
• CD-ROM—CD Read-Only Memory
• CD-RW—CD-Rewritable
• Security architecture | CDSA—Common Data Security Architecture
• Computer Emergency Response Team | CERT—Computer Emergency Response Team
• Consumer Electronics Show | CES—Consumer Electronics Show
• Compact Flash | CF—Compact Flash
• Computational fluid dynamics | CFD—Computational Fluid Dynamics
• Context-free grammar | CFG—Context-Free Grammar
• Control flow graph | CFG—Control Flow Graph
• Computer graphics | CG—Computer Graphics
• Color Graphics Adapter | CGA—Color Graphics Array
• Common Gateway Interface | CGI—Common Gateway Interface
• Computer-generated imagery | CGI—Computer-Generated Imagery
• Graph theory | CGT—Computational Graph Theory
• Challenge-handshake authentication protocol | CHAP—Challenge-Handshake Authentication Protocol
• Cylinder-head-sector | CHS—Cylinder-Head-Sector
• Classless Inter-Domain Routing | CIDR—Classless Inter-Domain Routing
• Server Message Block | CIFS—Common Internet Filesystem
• Common Information Model (computing) | CIM—Common Information Model
• Computationally Independent Model | CIM—Computationally Independent Model
• Chief information officer | CIO—Chief Information Officer
• Committed information rate | CIR—Committed information rate
• Complex instruction set computer | CISC—Complex Instruction Set Computer
• CJK characters | CJK—Chinese, Japanese, and Korean
• CJKV—Chinese, Japanese, Korean, and Vietnamese
• Command-line interface | CLI—Command Line Interface
• Common Language Runtime | CLR—Common Language Runtime
• Configuration management | CM—Configuration Management
• Content management | CM—Content Management
• Configuration management database | CMDB—Configuration Management Database
• Capability Maturity Model Integration | CMMI—Capability Maturity Model Integration
• CMOS—Complementary Metal-Oxide Semiconductor
• Current Mode of Operation | CMO—Current Mode of Operation
• Content management system | CMS—Content Management System
• Active Directory | CN—Canonical Name
• Lightweight Directory Access Protocol | CN—Common Name
• CNC—Computer Numerical Control
• Cryptographic Next Generation | CNG—Cryptographic Next Generation
• Cryptography Next Generation | CNG—Cryptography Next Generation
• Communications and Networking Riser | CNR—Communications and Networking Riser
• COBOL—Common Business-Oriented Language
• Component Object Model | COM—Component Object Model or communication
• Common Object Request Broker Architecture | CORBA—Common Object Request Broker Architecture
• Commercial off-the-shelf | COTS—Commercial Off-The-Shelf
• Cell (microprocessor) | CPA—Cell Processor Architecture
• CPAN—Comprehensive Perl Archive Network
• CP/M—Control Program/Monitor
• Common Public Radio Interface | CPRI—Common Public Radio Interface
• Characters Per Second | CPS—characters per second
• Central processing unit | CPU—Central Processing Unit
• Carriage return | CR—Carriage Return
• R (programming language) | CRAN—Comprehensive R Archive Network
• Cyclic redundancy check | CRC—Cyclic Redundancy Check
• Newline | CRLF—Carriage Return Line Feeds
• Customer relationship management | CRM—Customer Relationship Management
• Computer reservations system | CRS—Computer Reservations System
• Cathode ray tube | CRT—Cathode Ray Tube
• Create, read, update and delete | CRUD—Create, Read, Update and Delete
• AT Attachment | CS—Cable Select
• Computer science | CS—Computer Science
• Computer Science and Engineering | CSE—Computer Science and Engineering
• Common System Interface | CSI—Common System Interface
• Compatibility Support Module | CSM—Compatibility Support Module
• Carrier sense multiple access with collision detection | CSMA/CD—Carrier sense multiple access with collision detection
• Cloud service provider | CSP—Cloud Service Provider
• Communicating sequential processes | CSP—Communicating Sequential Processes
• Cross-site request forgery | CSRF—Cross-Site Request Forgery
• Cascading Style Sheets | CSS—Cascading Style Sheets
• Content Scramble System | CSS—Content-Scrambling System
• Closed source | CSS—Closed Source Software
• Cross-site scripting | CSS—Cross-Site Scripting
• Comma-separated values | CSV—Comma-Separated Values
• Computed axial tomography | CT—Computerized Tomography
• CTAN—Comprehensive TeX Archive Network
• Client-to-client protocol | CTCP—Client-To-Client Protocol
• Computer telephony integration | CTI—Computer Telephony Integration
• Compile time function execution | CTFE—Compile Time Function Execution
• Computation tree logic | CTL—Computational Tree Logic
• Close to Metal | CTM—Close To Metal
• Flow control (data) | CTS—Clear To Send
• Compatible Time-Sharing System | CTSS—Compatible Time-Sharing System
• IBM Common User Access | CUA—Common User Access
• Concurrent Versions System—Concurrent Versioning System]] | CVS * [[Concurrent Versions System | CVS—Concurrent Versioning System

• Digital-to-analog converter | DAC—Digital-To-Analog Converter
• Discretionary access control | DAC—Discretionary Access Control
• Database Abstraction Layer | DAL—Database Abstraction Layer
• Data access object | DAO—Data Access Object
• Data Access Objects | DAO—Data Access Objects
• Optical disc recording modes | DAO—Disk-At-Once
• Directory Access Protocol | DAP—Directory Access Protocol
• DARPA—Defense Advanced Research Projects Agency
• Digital Audio Tape | DAT—Digital Audio Tape
• Database | DB—Database
• Database administrator | DBA—Database Administrator
• DBCS—Double Byte Character Set
• Database management system | DBMS—Database Management System
• Direct Client-to-Client | DCC—Direct Client-to-Client
• Datagram Congestion Control Protocol | DCCP—Datagram Congestion Control Protocol
• DCC Alliance | DCCA—Debian Common Core Alliance
• Data Control Language | DCL—Data Control Language
• Distributed Control System | DCS—Distributed Control System
• Dublin Core | DCMI—Dublin Core Metadata Initiative
• Distributed Component Object Model | DCOM—Distributed Component Object Model
• Double density | DD—Double Density
• Dynamic Data Exchange | DDE—Dynamic Data Exchange
• DNS DHCP IP Address management | DDI—DNS DHCP & IP Address management
• Data Definition Language | DDL—Data Definition Language
• DDoS—Distributed Denial of Service
• DDR SDRAM | DDR—Double Data Rate
• Digital Equipment Corporation | DEC—Digital Equipment Corporation
• Data Encryption Standard | DES—Data Encryption Standard
• /dev | dev—development
• Deterministic finite automaton | DFA—Deterministic Finite Automaton
• Data flow diagram | DFD—Data Flow Diagram
• Depth-first search | DFS—Depth-First Search
• Distributed file system | DFS—Distributed File System
• Dworkin's Game Driver | DGD—Dworkin's Game Driver
• Dynamic Host Configuration Protocol | DHCP—Dynamic Host Configuration Protocol
• Dynamic HTML | DHTML—Dynamic Hypertext Markup Language
• Data Integrity Field | DIF—Data Integrity Field
• DIMM—Dual Inline Memory Module
• Deutsches Institut für Normung | DIN—Deutsches Institut für Normung
• Dual in-line package | DIP—Dual In-line Package
• DISM—Deployment Image and Service Management Tool
• DIVX (Digital Video Express) | DIVX—Digital Video Express
• DomainKeys Identified Mail | DKIM—Domain Keys Identified Mail
• Download | DL—Download
• Dynamic-link library | DLL—Dynamic Link Library
• Digital Living Network Alliance | DLNA—Digital Living Network Alliance
• Data loss protection | DLP—Data loss protection
• Direct memory access | DMA—Direct Memory Access
• Digital Millennium Copyright Act | DMCA—Digital Millennium Copyright Act
• Direct Media Interface | DMI—Direct Media Interface
• Data Manipulation Language | DML—Data Manipulation Language
• Definitive Media Library | DML—Definitive Media Library
• Dennis Ritchie | DMR—Dennis M. Ritchie
• DMZ (computing) | DMZ—Demilitarized Zone
• Lightweight Directory Access Protocol | DN—Distinguished Name
• Drag-and-drop | DND—Drag-and-Drop
• Domain Name System | DNS—Domain Name System
• Dead on arrival | DOA—Dead on Arrival
• DOCSIS—Data Over Cable Service Interface Specification
• Document Object Model | DOM—Document Object Model
• Denial-of-service attack | DoS—Denial of Service
• DOS—Disk Operating System
• Dot pitch | DP—Dot Pitch
• Deferred Procedure Call | DPC—Deferred Procedure Call
• Deep packet inspection | DPI—Deep Packet Inspection
• Dots per inch | DPI—Dots Per Inch
• DOS Protected Mode Interface | DPMI—DOS Protected Mode Interface
• VESA Display Power Management Signaling | DPMS—Display Power Management Signaling
• Disaster recovery | DR—Disaster Recovery
• Dynamic random-access memory | DRAM—Dynamic Random-Access Memory
• DR-DOS—Digital Research - Disk Operating System
• Direct Rendering Infrastructure | DRI—Direct Rendering Infrastructure
• Digital rights management | DRM—Digital Rights Management
• Direct Rendering Manager | DRM—Direct Rendering Manager
• Digital Signature Algorithm | DSA—Digital Signature Algorithm
• Document Schema Definition Languages | DSDL—Document Schema Definition Languages
• Dynamic Systems Development Method | DSDM—Dynamic Systems Development Method
• Digital subscriber line | DSL—Digital Subscriber Line
• Domain-specific language | DSL—Domain-Specific Language
• Digital subscriber line access multiplexer | DSLAM—Digital Subscriber Line Access Multiplexer
• Database Source Name | DSN—Database Source Name
• Data set (IBM mainframe) | DSN—Data Set Name
• Digital signal processor | DSP—Digital Signal Processor
• Document Style Semantics and Specification Language | DSSSL—Document Style Semantics and Specification Language
• Document Type Definition | DTD—Document Type Definition
• Data terminal equipment | DTE—Data Terminal Equipment or data transfer rate
• Desktop publishing | DTP—Desktop Publishing
• RS-232 | DTR—Data Terminal Ready or Data transfer rate
• DVD—Digital Versatile Disc
• DVD-R—DVD-Recordable
• DVD-ROM—DVD-Read Only Memory
• DVD-RW—DVD-Rewritable
• Digital Visual Interface | DVI—Digital Visual Interface
• Digital video recorder | DVR—Digital Video Recorder
• Data Warehouse | DW—Data Warehouse

• Enterprise application integration | EAI—Enterprise Application Integration
• Extensible Authentication Protocol | EAP—Extensible Authentication Protocol
• Exchange ActiveSync | EAS—Exchange ActiveSync
• Extended Binary Coded Decimal Interchange Code | EBCDIC—Extended Binary Coded Decimal Interchange Code
• Extensible Binary Meta Language | EBML—Extensible Binary Meta Language
• Elliptic curve cryptography | ECC—Elliptic Curve Cryptography
• Ecma International | ECMA—European Computer Manufacturers Association
• Explicit Congestion Notification | ECN—Explicit Congestion Notification
• eCos | ECOS—Embedded Configurable Operating System
• Expense and Cost Recovery System (ECRS) | ECRS—Expense and Cost Recovery System
• Electronic design automation | EDA—Electronic Design Automation
• Enhanced Data Rates for GSM Evolution | EDGE— Enhanced Data rates for GSM Evolution
• Electronic Data Interchange | EDI—Electronic Data Interchange
• Dynamic random access memory | EDO—Extended Data Out
• Electronic Delay Storage Automatic Calculator | EDSAC—Electronic Delay Storage Automatic Calculator
• EDVAC—Electronic Discrete Variable Automatic Computer
• EEPROM—Electronically Erasable Programmable Read-Only Memory
• Electronic Frontier Foundation | EFF—Electronic Frontier Foundation
• Extensible Firmware Interface | EFI—Extensible Firmware Interface
• Eight-to-fourteen modulation | EFM—Eight-to-Fourteen Modulation
• Ethernet in the First Mile | EFM—Ethernet in the First Mile
• Encrypting File System | EFS—Encrypting File System
• Enhanced Graphics Adapter | EGA—Enhanced Graphics Array
• Electronic mail | E-mail—Electronic mail
• Exterior Gateway Protocol | EGP—Exterior Gateway Protocol
• Electronic identity card | eID—electronic ID card
• EIDE—Enhanced IDE
• Enhanced Interior Gateway Routing Protocol | EIGRP—Enhanced Interior Gateway Routing Protocol
• Extended Industry Standard Architecture | EISA—Extended Industry Standard Architecture
• Extremely low frequency | ELF—Extremely Low Frequency
• Executable and Linkable Format | ELF—Executable and Linkable Format
• Elm (e-mail client) | ELM—ELectronic Mail
• Emacs | EMACS—Editor MACroS
• Expanded memory | EMS—Expanded Memory Specification
• ENIAC—Electronic Numerical Integrator And Computer
• End-of-Day | EOD—End of Day
• End-of-file | EOF—End of File
• Newline | EOL—End of Line
• End of Message | EOM—End Of Message
• End of Support | EOS—End OF Support
• Explicitly parallel instruction computing | EPIC—Explicitly Parallel Instruction Computing
• EPROM—Erasable Programmable Read-Only Memory
• Entity-relationship diagram | ERD—Entity-Relationship Diagram
• Entity-relationship model | ERM—Entity-Relationship Model
• Enterprise resource planning | ERP—Enterprise Resource Planning
• external SATA | eSATA—external SATA
• Enterprise service bus | ESB—Enterprise service bus
• ESCON—Enterprise Systems Connection
• Electrostatic discharge | ESD—Electrostatic Discharge
• Eric S. Raymond | ESR—Eric Steven Raymond
• Extract, transform, load | ETL—Extract, Transform, Load
• Event Tracing for Windows | ETW—Event Tracing for Windows
• Extended Unix Code | EUC—Extended Unix Code
• End user license agreement | EULA—End User License Agreement
• Extended Window Manager Hints | EWMH—Extended Window Manager Hints
• Extended file system | EXT—EXTended file system

• FORTRAN Assembly Program | FAP—FORTRAN Assembly Program
• FASM—Flat ASseMbler
• File Allocation Table | FAT—File Allocation Table
• FAQ—Frequently Asked Questions
• Fully Buffered DIMM | FBDIMM—Fully Buffered Dual Inline Memory Module
• FC-AL—Fibre Channel Arbitrated Loop
• File control block | FCB—File Control Block
• Frame check sequence | FCS—Frame Check Sequence
• Floppy disk controller | FDC—Floppy Disk Controller
• Fedora Directory Server | FDS—Fedora Directory Server
• Frequency-division multiple access | FDD—Frequency-Division Duplexing
• Floppy disk drive | FDD—Floppy Disk Drive
• Fiber distributed data interface | FDDI—Fiber Distributed Data Interface
• Frequency-division multiplexing | FDM—Frequency-Division Multiplexing
• Frequency-division multiple access | FDMA—Frequency-Division Multiple Access
• Forward error correction | FEC—Forward Error Correction
• S-LINK | FEMB—Front-End Motherboard
• Field-effect transistor | FET—Field Effect Transistor
• Filesystem Hierarchy Standard | FHS—Filesystem Hierarchy Standard
• FICON—FIber CONnectivity
• FIFO (computing and electronics) | FIFO—First In First Out
• FIPS 140 | FIPS—Federal Information Processing Standards
• FL (programming language) | FL—Function Level
• Free Lossless Audio Codec | FLAC—Free Lossless Audio Codec
• FLOPS—FLoating-Point Operations Per Second
• Free and open source software | FLOSS—Free/Libre/Open Source Software
• Fixed Mobile Convergence | FMC— Fixed Mobile Convergence “Mobile UC or Unified Communications over Wireless”
• Future Mode of Operation | FMO—Future Mode of Operation
• Free On-line Dictionary of Computing | FOLDOC—Free On-line Dictionary of Computing
• FOSDEM—Free and Open source Software Developers' European Meeting
• Formatting Output Specification Instance | FOSI—Formatted Output Specification Instance
• Free and open source software | FOSS—Free and Open Source Software
• FP (programming language) | FP—Function Programming
• Field-programmable gate array | FPGA—Field Programmable Gate Array
• Floating Point Systems | FPS—Floating Point Systems
• Floating-point unit | FPU—Floating Point Unit
• Field-replaceable unit | FRU—Field Replaceable Unit
• File system | FS—File System
• Front-side bus | FSB—Front Side Bus
• fsck—File System Check
• Free Software Foundation | FSF—Free Software Foundation
• Finite-state machine | FSM—Finite State Machine
• Fiber to the Antenna | FTTA—Fiber To The Antenna
• Fiber to the Curb | FTTC—Fiber To The Curb
• Fiber to the home | FTTH—Fiber To The Home
• Fiber to the premises | FTTP—Fiber To The Premises
• File Transfer Protocol | FTP—File Transfer Protocol
• Fully qualified domain name | FQDN—Fully Qualified Domain Name
• Fear, uncertainty and doubt | FUD—Fear Uncertainty Doubt
• Whitespace (computer science) | FWS—Folding White Space
• File eXchange Protocol | FXP—File eXchange Protocol
• For Your Information | FYI—For Your Information
• FVEK—Full Volume Encryption Key

• Globalization | G11N—Globalization
• GNU Assembler | Gas—GNU Assembler
• Gigabit | Gb—Gigabit
• Gigabyte | GB—Gigabyte
• GNU Compiler Collection | GCC—GNU Compiler Collection
• GNU Compiler for Java | GCJ—GNU Compiler for Java
• Group coded recording | GCR—Group Coded Recording
• GNU Debugger | GDB—GNU Debugger
• Graphics Device Interface | GDI—Graphics Device Interface
• GNU Free Documentation License | GFDL—GNU Free Documentation License
• Graphics Interchange Format | GIF—Graphics Interchange Format
• Garbage In, Garbage Out | GIGO—Garbage In, Garbage Out
• GIMP—GNU Image Manipulation Program
• Great Internet Mersenne Prime Search | GIMPS—Great Internet Mersenne Prime Search
• Geographic information system | GIS—Geographic Information System
• OpenGL Utility Toolkit | GLUT—OpenGL Utility Toolkit
• Geography Markup Language | GML—Geography Markup Language
• GNOME—GNU Network Object Model Environment
• GUI-Graphical User Interfase
• GNU—GNU's Not Unix
• GOMS—Goals, Operators, Methods, and Selection rules
• GPUTILS | GPASM—GNU PIC ASseMbler
• IBM General Parallel File System | GPFS—General Parallel File System
• GNU Privacy Guard | GPG—GNU Privacy Guard
• GPGPU—General-Purpose Computing on Graphics Processing Units
• GPIB—General-Purpose Instrumentation Bus
• GNU General Public License | GPL—General Public License
• Domain-specific language | GPL—General-Purpose Language
• General Packet Radio Service | GPRS—General Packet Radio Service
• GUID Partition Table | GPT—GUID Partition Table
• Graphics processing unit | GPU—Graphics Processing Unit
• GNU GRUB | GRUB—Grand Unified Boot-Loader
• GERAN—GSM EDGE Radio Access Network
• GSM—Global System for Mobile Communications
• GTK+—GIMP Toolkit
• Graphical user interface | GUI—Graphical User Interface
• Globally Unique Identifier | GUID—Globally Unique IDentifier
• Google Web Toolkit | GWT—Google Web Toolkit
• IT Networking Services | GYR—IT Networking

• High availability | HA—High Availability
• Hardware abstraction layer | HAL—Hardware Abstraction Layer
• HTML Application Rapid Development | HARD—HTML Application Rapid Development
• Houston Automatic Spooling Priority | HASP—Houston Automatic Spooling Priority
• Host adapter | HBA—Host Bus Adapter
• Human–computer interaction | HCI—Human Computer Interaction
• High density | HD—High Density
• Hard disk drive | HDD—Hard Disk Drive
• Hardware compatibility list | HCL—Hardware Compatibility List
• HD DVD—High Definition DVD
• Hardware description language | HDL—Hardware Description Language
• HDMI—High-Definition Multimedia Interface
• HECI—Host Embedded Controller Interface
• High frequency | HF—High Frequency
• Hierarchical File System | HFS—Hierarchical File System
• Hybrid drive | HHD—Hybrid Hard Drive
• Human interface device | HID—Human Interface Device
• Human interface guidelines | HIG—Human Interface Guidelines
• GNU Hurd | HIRD—Hurd of Interfaces Representing Depth
• IBM High-Level Assembler | HLASM—High Level ASseMbler
• HTTP Live Streaming | HLS—HTTP Live Streaming
• High memory area | HMA—High Memory Area
• Hewlett-Packard | HP—Hewlett-Packard
• High-performance computing | HPC—High-Performance Computing
• High Performance File System | HPFS—High Performance File System
• High-Speed Downlink Packet Access | HSDPA—High-Speed Downlink Packet Access
• High-throughput computing | HTC—High-Throughput Computing
• Hierarchical storage management | HSM—Hierarchical Storage Management
• Hyper-threading | HT—Hyper Threading
• Hierarchical temporal memory | HTM—Hierarchical Temporal Memory
• HTML—Hypertext Markup Language
• Hypertext Transfer Protocol | HTTP—Hypertext Transfer Protocol
• Daemon (computer software) | HTTPd—Hypertext Transport Protocol Daemon
• HTTPS—HTTP Secure
• HyperTransport | HTX—HyperTransport eXpansion
• GNU Hurd | HURD—Hird of Unix-Replacing Daemons
• Holographic Versatile Disc | HVD—Holographic Versatile Disc
• Hertz | Hz—Hertz

• I²C—Inter-Integrated Circuit
• I²S—Integrated Interchip Sound
• Internationalization and localization | I18N—Internationalization
• Internet Assigned Numbers Authority | IANA—Internet Assigned Numbers Authority
• Application binary interface | iBCS—Intel Binary Compatibility Standard
• IBM—International Business Machines
• Integrated circuit | IC—Integrated Circuit
• ICANN—Internet Corporation for Assigned Names and Numbers
• In-circuit emulator | ICE—In-Circuit Emulator
• Intrusion Countermeasures Electronics | ICE—Intrusion Countermeasure Electronics
• I/O Controller Hub | ICH—I/O Controller Hub
• Internet Control Message Protocol | ICMP—Internet Control Message Protocol
• Internet Cache Protocol | ICP—Internet Cache Protocol
• Internet Connection Sharing | ICS—Internet Connection Sharing
• Information technology | ICT—Information and Communication Technology
• Integrated development environment | IDE—Integrated Development Environment
• Advanced Technology Attachment | IDE—Integrated Drive Electronics
• Intermediate distribution frame | IDF—Intermediate Distribution Frame
• Intermediate Data Format | IDF—Intermediate Data Format
• IDL (programming language) | IDL—Interactive Data Language
• Interface description language | IDL—Interface Definition Language
• Intrusion detection system | IDS—Intrusion Detection System
• Internet Explorer | IE—Internet Explorer
• International Electrotechnical Commission | IEC—International Electrotechnical Commission
• Institute of Electrical and Electronics Engineers | IEEE—Institute of Electrical and Electronics Engineers
• Internet Engineering Task Force | IETF—Internet Engineering Task Force
• IFGICT—International Federation of Global & Green ICT
• Integrated Facility for Linux | IFL—Integrated Facility for Linux
• Internet Group Management Protocol | IGMP—Internet Group Management Protocol
• Interior Gateway Routing Protocol | IGRP—Interior Gateway Routing Protocol
• Independent hardware vendor | IHV—Independent Hardware Vendor
• General Inter-ORB Protocol | IIOP—Internet Inter-Orb Protocol
• Internet Information Services | IIS—Internet Information Services
• Internet Key Exchange | IKE—Internet Key Exchange
• Intermediate language | IL—Intermediate Language
• Instant messaging | IM—Instant Messaging
• Internet Message Access Protocol | IMAP—Internet Message Access Protocol
• Input method editor | IME—Input Method Editor
• Information security | INFOSEC—Information Systems Security
• Input/output | I/O—Input/output
• Internet of Things | IoT—Internet of Things
• Intellectual property | IP—Intellectual Property
• Internet Protocol | IP—Internet Protocol
• IP address management | IPAM—IP Address Management
• Inter-process communication | IPC—Inter-Process Communication
• Initial Program Load | IPL—Initial Program Load
• Intelligent Platform Management Interface | IPMI—Intelligent Platform Management Interface
• Interprocedural optimization | IPO—Inter Procedural Optimization
• Internet Printing Protocol | IPP—Internet Printing Protocol
• IPS panel | IPS—In-Plane Switching
• Instructions per second | IPS—Instructions Per Second
• Intrusion prevention system | IPS—Intrusion Prevention System
• IPsec—Internet Protocol security
• IPTV—Internet Protocol Television
• IPv4—Internet Protocol version 4
• IPv6—Internet Protocol version 6
• Internetwork Packet Exchange | IPX—Internetwork Packet Exchange
• Intermediate language | IR—Intermediate Representation
• Internet Relay Chat | IRC—Internet Relay Chat
• Infrared Data Association | IrDA—Infrared Data Association
• Internationalized Resource Identifier | IRI—Internationalized Resource Identifier
• I/F—Interface
• I/O request packet | IRP—I/O Request Packet
• Interrupt request | IRQ—Interrupt Request
• Information systems | IS—Information Systems
• IS-IS—Intermediate System to Intermediate System
• Industry Standard Architecture | ISA—Industry Standard Architecture
• Instruction set | ISA—Instruction Set Architecture
• ISAM—Indexed Sequential Access Method
• ISATAP—Intra-Site Automatic Tunnel Addressing Protocol
• Internet Storm Center | ISC—Internet Storm Center
• iSCSI—Internet Small Computer System Interface
• Integrated services digital network | ISDN—Integrated Services Digital Network
• International Organization for Standardization | ISO—International Organization for Standardization
• Internet Storage Name Service | iSNS—Internet Storage Name Service
• Internet service provider | ISP—Internet Service Provider
• ISPF—Interactive System Productivity Facility
• Interrupt handler | ISR—Interrupt Service Routine
• Independent software vendor | ISV—Independent Software Vendor
• Information technology | IT—Information Technology
• Information Technology Infrastructure Library | ITIL—Information Technology Infrastructure Library
• Interval temporal logic | ITL—Interval Temporal Logic
• International Telecommunication Union | ITU—International Telecommunication Union
• Interactive voice response | IVRS—Interactive Voice Response System
• Interactive Virtual Classroom | IVCR—Interactive Virtual Classroom

• Java Platform, Enterprise Edition | J2EE—Java 2 Enterprise Edition
• Java Platform, Micro Edition | J2ME—Java 2 Micro Edition
• Java Platform, Standard Edition | J2SE—Java 2 Standard Edition
• Java Architecture for XML Binding | JAXB—Java Architecture for XML Binding
• Java API for XML-based RPC | JAX-RPC—Java XML for Remote Procedure Calls
• Java API for XML Processing | JAXP—Java API for XML Processing
• JBOD—Just a Bunch of Disks
• Java Cryptography Extension | JCE

  Java Cryptography Extension

• Job Control Language | JCL—Job Control Language
• Java Community Process | JCP—Java Community Process
• Java Database Connectivity | JDBC—Java Database Connectivity
• Java Development Kit | JDK—Java Development Kit
• Java Platform, Enterprise Edition | JEE—Java Enterprise Edition
• Job Entry Subsystem 2/3 | JES—Job Entry Subsystem
• Java Desktop System | JDS—Java Desktop System
• Java Foundation Classes | JFC—Java Foundation Classes
• JFET—Junction Field-Effect Transistor
• JFS (file system) | JFS—IBM Journaling File System
• Jini | JINI—Jini Is Not Initials
• Just-in-time compilation | JIT—Just-In-Time
• Java Platform, Micro Edition | JME—Java Micro Edition
• Java Management Extensions | JMX—Java Management Extensions
• Java Message Service | JMS—Java Message Service
• Java Naming and Directory Interface | JNDI—Java Naming and Directory Interface
• Java Native Interface | JNI—Java Native Interface
• Instruction set | JNZ—Jump non-zero
• JPEG—Joint Photographic Experts Group
• Java Runtime Environment | JRE—Java Runtime Environment
• JavaScript | JS—JavaScript
• Java Platform, Standard Edition | JSE—Java Standard Edition
• JSON—JavaScript Object Notation
• Jackson Structured Programming | JSP—Jackson Structured Programming
• JavaServer Pages | JSP—JavaServer Pages
• Joint Test Action Group | JTAG—Joint Test Action Group
• Java User Group | JUG—Java Users Group
• Java Virtual Machine | JVM—Java Virtual Machine

• The C Programming Language (book) | K&R—Kernighan and Ritchie
• Keyboard (computing) | KB—Keyboard
• Kilobit | Kb—Kilobit
• Kilobyte | KB—Kilobyte
• Knowledge base | KB—Knowledge Base
• Kibibyte | KiB—Kibibyte
• KDE—K Desktop Environment
• Kilohertz | kHz—Kilohertz
• KM—Knowledge Machine
• KRL (programming language) | KRL—Knowledge Representation Language
• KVM switch | KVM—Keyboard, Video, Mouse

• Internationalization and localization | L10N—Localization
• Layer 2 Tunneling Protocol | L2TP—Layer two Tunneling Protocol
• Link Aggregation Control Protocol | LACP—Link Aggregation Control Protocol
• LAMP (software bundle) | LAMP—Linux Apache MySQL Perl
• LAMP (software bundle) | LAMP—Linux Apache MySQL PHP
• LAMP (software bundle) | LAMP—Linux Apache MySQL Python
• Local area network | LAN—Local Area Network
• Logical block addressing | LBA—Logical Block Addressing
• Load balancing (computing) | LB—Load Balancer
• Liquid crystal display | LCD—Liquid Crystal Display
• Least Cost Routing | LCR—Least Cost Routing
• Liquid crystal on silicon | LCOS—Liquid Crystal On Silicon
• Lightweight Directory Access Protocol | LDAP—Lightweight Directory Access Protocol
• Logical volume management | LE—Logical Extents
• Light-emitting diode | LED—Light-Emitting Diode
• Line feed | LF—Line Feed
• Low frequency | LF—Low Frequency
• Linux From Scratch | LFS—Linux From Scratch
• GNU Lesser General Public License | LGPL—Lesser General Public License
• Library (computing) | LIB—LIBrary
• Low insertion force | LIF—Low Insertion Force
• LIFO (computing) | LIFO—Last In First Out
• LILO (boot loader) | LILO—Linux Loader
• Lisp (programming language) | LISP—LISt Processing
• Linux kernel mailing list | LKML—Linux Kernel Mailing List
• LAN Manager | LM—Lan Manager
• Source lines of code | LOC—Lines of Code
• LPC (programming language) | LPC—Lars Pensjö C
• Linux Professional Institute | LPI—Linux Professional Institute
• Parallel port | LPT

  Line Print Terminal

• Least Recently Used | LRU—Least Recently Used
• Least significant bit | LSB—Least Significant Bit
• Linux Standard Base | LSB—Linux Standard Base
• Large Scale Integration | LSI—Large-Scale Integration
• Long Term Evolution | LTE—Long Term Evolution
• Linear temporal logic | LTL—Linear Temporal Logic
• Bi-directional text | LTR—Left-to-Right
• Linux User Group | LUG—Linux User Group
• Logical Unit Number | LUN—Logical Unit Number
• Logical volume management | LV—Logical Volume
• Low-voltage differential signaling | LVD—Low Voltage Differential
• Logical volume management | LVM—Logical Volume Management
• Lempel–Ziv–Welch | LZW—Lempel-Ziv-Welch
• Land Grid Array | LGA—Land Grid Array

• Mandatory access control | MAC—Mandatory Access Control
• Media Access Control | MAC—Media Access Control
• Metropolitan area network | MAN—Metropolitan Area Network
• Mobile ad hoc network | MANET—Mobile Ad-Hoc Network
• Messaging Application Programming Interface | MAPI—Messaging Application Programming Interface
• Megabit | Mb—Megabit
• Megabyte | MB—Megabyte
• Multi-byte character set | MBCS—Multi Byte Character Set
• Model-based design | MBD—Model-Based Design
• Master boot record | MBR—Master Boot Record
• Micro Channel architecture | MCA—Micro Channel Architecture
• Microsoft Certified Professional | MCA—Microsoft Certified Architect
• Microsoft Certified Application Developer or M.C.A.D. | MCAD—Microsoft Certified Application Developer
• Microsoft Certified Application Specialist or M.C.A.S. | MCAS—Microsoft Certified Application Specialist
• MCDBA—Microsoft Certified DataBase Administrator
• Microsoft Certified Desktop Support Technician or M.C.D.S.T. | MCDST—Microsoft Certified Desktop Support Technician
• Microsoft Certified Professional | MCITP—Microsoft Certified Information Technology Professional
• Microsoft Certified Professional | MCM—Microsoft Certified Master
• Microsoft Certified Professional | MCP—Microsoft Certified Professional
• Multiple Channels Per Carrier | MCPC—Multiple Channels Per Carrier
• Microsoft Certified Professional | MCPD—Microsoft Certified Professional Developer
• Microsoft Certified Systems Administrator or M.C.S.A. | MCSA—Microsoft Certified Systems Administrator
• Microsoft Certified Solution Developer or M.C.S.D. | MCSD—Microsoft Certified Solution Developer
• Microsoft Certified Systems Engineer or M.C.S.E. | MCSE—Microsoft Certified Systems Engineer
• Microsoft Certified Trainer or M.C.T. | MCT—Microsoft Certified Trainer
• Microsoft Certified Professional | MCTS—Microsoft Certified Technology Specialist
• Mail delivery agent | MDA—Mail Delivery Agent
• Model-driven architecture | MDA—Model-Driven Architecture
• IBM Monochrome Display Adapter | MDA—Monochrome Display Adapter
• Model-driven software development | MDD/MDSD—Model-Driven (Software) Development
• Main distribution frame | MDF—Main Distribution Frame
• Multiple document interface | MDI—Multiple Document Interface
• Microsoft Edge | ME—Microsoft Edge
• Windows Me | ME—[Windows] Millennium Edition
• Medium frequency | MF—Medium Frequency
• Microsoft Foundation Class Library | MFC—Microsoft Foundation Classes
• Modified Frequency Modulation | MFM—Modified Frequency Modulation
• Media Gateway Control Protocol | MGCP—Media Gateway Control Protocol
• Megahertz | MHz—Megahertz
• Management information base | MIB—Management Information Base
• Magnetic ink character recognition | MICR—Magnetic Ink Character Recognition
• Musical Instrument Digital Interface | MIDI—Musical Instrument Digital Interface
• MIMD—Multiple Instruction, Multiple Data
• MIMO—Multiple-Input Multiple-Output
• MINIX—MIni-uNIX
• Million instructions per second | MIPS—Million Instructions Per Second
• MIPS architecture | MIPS—Microprocessor without Interlocked Pipeline Stages
• Management information system | MIS—Management Information Systems
• MISD—Multiple Instruction, Single Data
• Massachusetts Institute of Technology | MIT—Massachusetts Institute of Technology
• MIME—Multipurpose Internet Mail Extensions
• Multichannel Multipoint Distribution Service | MMDS—Multichannel Multipoint Distribution Service
• Mortality Medical Data System | MMDS—Mortality Medical Data System
• Man-machine interface | MMI—Man Machine Interface.
• Memory-mapped I/O | MMIO—Memory-Mapped I/O
• Massively multiplayer online role-playing game | MMORPG—Massively Multiplayer Online Role-Playing Game
• Microsoft Management Console | MMC— Microsoft Management Console
• Multi-mode optical fiber | MMF—Multi-Mode (optical) Fiber
• Memory management unit | MMU—Memory Management Unit
• MMX (instruction set) | MMX—Multi-Media Extensions
• Multiple-image Network Graphics | MNG—Multiple-image Network Graphics
• Motherboard | MoBo—Motherboard
• Message-oriented middleware | MOM—Message-Oriented Middleware
• MOO—MUD Object Oriented
• Metaobject protocol | MOP—Meta-Object Protocol
• Microsoft Office Specialist or M.O.S. | MOS—Microsoft Office Specialist
• MOSFET—Metal-Oxide Semiconductor Field Effect Transistor
• Motd (Unix) | MOTD—Message Of The Day
• Microsoft Certified Professional | MOUS—Microsoft Office User Specialist
• QuickTime File Format | MOV—Apple QuickTime Multimedia File
• Motion Picture Association of America | MPAA—Motion Picture Association of America
• Moving Picture Experts Group | MPEG—Motion Pictures Experts Group
• Mozilla Public License | MPL—Mozilla Public License
• Multiprotocol Label Switching | MPLS—Multiprotocol Label Switching
• Microprocessor | MPU—Microprocessor Unit
• USB flash drive | MS—Memory Stick
• Microsoft | MS—Microsoft
• Most significant bit | MSB—Most Significant Bit
• Microsoft Network | MSN—Microsoft Network
• MS-DOS—Microsoft DOS
• Machine translation | MT—Machine Translation
• Message transfer agent | MTA—Mail Transfer Agent
• Microsoft Certified Professional | MTA—Microsoft Technology Associate
• MTBF—Mean Time Between Failures
• Maximum transmission unit | MTU—Maximum Transmission Unit
• Mail submission agent | MSA—Mail Submission Agent
• Microsoft Developer Network | MSDN—Microsoft Developer Network
• MSI | MSI—Medium-Scale Integration
• Message Signaled Interrupts | MSI—Message Signaled Interrupt
• Windows Installer | MSI—Microsoft Installer
• Mail User Agent | MUA—Mail User Agent
• MUD—Multi-User Dungeon
• Model–view–controller | MVC—Model-View-Controller
• Microsoft Most Valuable Professional | MVP—Most Valuable Professional
• MVS—Multiple Virtual Storage
• Mobile World Congress | MWC—Mobile World Congress
• MX record | MX—Mail exchange
• Material Exchange Format | MXF—Material Exchange Format

• Negative-acknowledge character | NACK—Negative ACKnowledgement
• Negative-acknowledge character | NAK—Negative AcKnowledge Character
• NaN—Not a Number
• Network Access Protection | NAP—Network Access Protection
• Network-attached storage | NAS—Network-Attached Storage
• Netwide Assembler | NASM—Netwide ASseMbler
• Network address translation | NAT—Network Address Translation
• NetWare Core Protocol | NCP—NetWare Core Protocol
• Native Command Queuing | NCQ—Native Command Queuing
• National Center for Supercomputing Applications | NCSA—National Center for Supercomputing Applications
• Network Driver Interface Specification | NDIS—Network Driver Interface Specification
• Novell Embedded Systems Technology | NDPS—Novell Distributed Print Services
• Novell Directory Services | NDS—Novell Directory Services
• Network Equipment Provider | NEP—Network Equipment Provider
• NetBIOS—Network Basic Input/Output System
• NetBIOS over TCP/IP | NetBT—NetBIOS over TCP/IP
• Near end crosstalk | NEXT—Near-End CrossTalk
• Nondeterministic finite automaton | NFA—Nondeterministic Finite Automaton
• Near field communication | NFC—Near field communication
• Network File System (protocol) | NFS—Network File System
• NGL—aNGeL
• Next-Generation Secure Computing Base | NGSCB—Next-Generation Secure Computing Base
• National Instruments | NI—National Instruments
• Network interface controller | NIC—Network Interface Controller
• No Internal Message | NIM—No Internal Message
• Non-blocking I/O (Java) | NIO—Non-blocking I/O
• National Institute of Standards and Technology | NIST—National Institute of Standards and Technology
• Natural language processing | NLP—Natural Language Processing
• Internationalization and localization | NLS—Native Language Support
• Non-maskable interrupt | NMI—Non-Maskable Interrupt
• Network News Transfer Protocol | NNTP—Network News Transfer Protocol
• Network operations center | NOC—Network Operations Center
• NOP—No OPeration
• Network operating system | NOS—Network Operating System
• NP (complexity) | NP—Nondeterministic Polynomial time
• Netscape Public License | NPL—Netscape Public License
• Native POSIX Thread Library | NPTL—Native POSIX Thread Library
• Network Processing Unit | NPU—Network Processing Unit
• Netscape | NS—Netscape
• Network Security Appliance | NSA—Network Security Appliance
• Network Service Interface | NSI—Network Service Interface
• Netscape Portable Runtime | NSPR—Netscape Portable Runtime
• Novell Storage Services | NSS—Novell Storage Service
• Network Security Services | NSS—Network Security Services
• Name Service Switch | NSS—Name Service Switch
• Windows NT | NT—New Technology
• NTFS—NT Filesystem
• NTLM—NT Lan Manager
• Network Time Protocol | NTP—Network Time Protocol
• Non-Uniform Memory Access | NUMA—Non-Uniform Memory Access
• Non-uniform rational B-spline | NURBS—Non-Uniform Rational B-Spline
• Network Video Recorder | NVR—Network Video Recorder
• Non-volatile random access memory | NVRAM—Non-Volatile Random Access Memory

• OASIS (organization) | OASIS—Organization for the Advancement of Structured Information Standards
• Operational Acceptance Testing | OAT—Operational Acceptance Testing
• OBSAI—Open Base Station Architecture Initiative
• Open Database Connectivity | ODBC—Open Database Connectivity
• Original equipment manufacturer | OEM—Original Equipment Manufacturer
• Open Enterprise Server | OES—Open Enterprise Server
• Orthogonal Frequency Division Multiplexing | OFDM—Orthogonal Frequency Division Multiplexing
• Open and Free Technology Community | OFTC—Open and Free Technology Community
• Object identifier | OID—Object Identifier
• Online analytical processing | OLAP—Online Analytical Processing
• Object Linking and Embedding | OLE—Object Linking and Embedding
• Organic light-emitting diode | OLED—Organic Light Emitting Diode
• One Laptop per Child | OLPC—One Laptop per Child
• Online transaction processing | OLTP—Online Transaction Processing
• Relocatable Object Module Format | OMF—Object Module Format
• Object Management Group | OMG—Object Management Group
• Optical Mark Recognition | OMR—Optical Mark Reader
• Object-oriented programming | OO—Object-Oriented
• OpenOffice.org | OO—OpenOffice
• Out-of-order execution | OOE—Out-of-Order Execution
• Out of memory | OOM—Out Of Memory
• OpenOffice.org | OOo—OpenOffice.org
• Out-of-order execution | OoOE—Out-of-Order Execution
• Object-oriented programming | OOP—Object-Oriented Programming
• Out of the box (feature) | OOTB—Out of the box
• OPML—Outline Processor Markup Language
• Object request broker | ORB—Object Request Broker
• Object-relational mapping | ORM—Object-Relational Mapping
• Open source | OS—Open Source
• Operating system | OS—Operating System
• O'Reilly Open Source Convention | OSCON—O'Reilly Open Source CONvention
• OSDN—Open Source Development Network
• Open Source Initiative | OSI—Open Source Initiative
• Open Systems Interconnection | OSI—Open Systems Interconnection
• Open Shortest Path First | OSPF—Open Shortest Path First
• Open Sound System | OSS—Open Sound System
• Open source software | OSS—Open-Source Software
• Operations support system | OSS—Operations Support System
• Open Source Technology Group | OSTG—Open Source Technology Group
• Organizationally Unique Identifier | OUI—Organisationally Unique Identifier

• Peer-to-peer | P2P—Peer-To-Peer
• Platform as a service | PaaS—Platform as a Service
• Personal area network | PAN—Personal Area Network
• Password authentication protocol | PAP—Password Authentication Protocol
• PARC (company) | PARC—Palo Alto Research Center
• Parallel ATA | PATA—Parallel ATA
• Portable Batch System | PBS—Portable Batch System
• Personal computer | PC—Personal Computer
• Printed circuit board | PCB—Printed Circuit Board
• Process control block | PCB—Process Control Block
• IBM PC DOS | PC DOS—Personal Computer Disc Operating System
• Peripheral Component Interconnect | PCI—Peripheral Component Interconnect
• PCI Express | PCIe—PCI Express
• PCI Extended | PCI-X—PCI Extended
• Printer Command Language | PCL—Printer Command Language
• Personal Computer Memory Card International Association | PCMCIA—Personal Computer Memory Card International Association
• Pulse-code modulation | PCM—Pulse-Code Modulation
• Perl Compatible Regular Expressions | PCRE—Perl Compatible Regular Expressions
• Public domain | PD—Public Domain
• Personal digital assistant | PDA—Personal Digital Assistant
• Portable Document Format | PDF—Portable Document Format
• Plesiochronous Digital Hierarchy | PDH—Plesiochronous Digital Hierarchy
• Programmed Data Processor | PDP—Programmed Data Processor
• Logical volume management | PE—Physical Extents
• Perl | PERL—Practical Extraction and Reporting Language
• Please Find Atachment | PFA—Please Find Attachment
• Peripheral Gateway | PG—Peripheral Gateway
• Pin grid array | PGA—Pin Grid Array
• Field-programmable gate array | PGA—Programmable Gate Array
• Profile-guided optimization | PGO—Profile-Guided Optimization
• Pretty Good Privacy | PGP—Pretty Good Privacy
• PHP—Hypertext Preprocessor
• PIC microcontroller | PIC—Peripheral Interface Controller
• Programmable Interrupt Controller | PIC—Programmable Interrupt Controller
• PID controller | PID—Proportional-Integral-Derivative
• Process identifier | PID—Process ID
• Personal information manager | PIM—Personal Information Manager
• Pine (e-mail client) | PINE—Program for Internet News and Email
• Platform Independent Model | PIM—Platform Independent Model
• Programmed input/output | PIO—Programmed Input/Output
• PKCS—Public Key Cryptography Standards
• Public key infrastructure | PKI—Public Key Infrastructure
• Power line communication | PLC—Power Line Communication
• Programmable logic controller | PLC—Programmable Logic Controller
• Programmable logic device | PLD—Programmable Logic Device
• PL/I—Programming Language One
• PL/M—Programming Language for Microcomputers
• PL/P—Programming Language for Prime
• Power line communication | PLT—Power Line Telecommunications
• Power-on self-test | PMM—POST Memory Manager
• Portable Network Graphics | PNG—Portable Network Graphics
• Plug and play | PnP—Plug-and-Play
• Peer Name Resolution Protocol | PNRP—Peer Name Resolution Protocol
• Power over Ethernet | PoE—Power over Ethernet
• Persistent Object Identifier | POID—Persistent Object Identifier
• Plain Old Java Object | POJO—Plain Old Java Object
• Point of presence | POP—Point of Presence
• Post Office Protocol | POP3—Post Office Protocol v3
• POSIX—Portable Operating System Interface, formerly IEEE-IX
• Power-on self-test | POST—Power-On Self Test
• PowerPC | PPC—PowerPC
• Pixels per inch | PPI—Pixels Per Inch
• Point-to-Point Protocol | PPP—Point-to-Point Protocol
• Point-to-Point Protocol over ATM | PPPoA—PPP over ATM
• Point-to-Point Protocol over Ethernet | PPPoE—PPP over Ethernet
• Point-to-point tunneling protocol | PPTP—Point-to-Point Tunneling Protocol
• Pull request | PR—Pull Request
• PostScript | PS—PostScript
• IBM Personal System/2 | PS/2—Personal System/2
• Professional Services Automation | PSA—Professional Services Automation
• Platform Specific Model | PSM—Platform Specific Model
• Power supply | PSU—Power Supply Unit
• PSVI—Post-Schema-Validation Infoset
• PTS-DOS—PhysTechSoft - Disk Operating System
• Logical volume management | PV—Physical Volume
• Logical volume management | PVG—Physical Volume Group
• Personal video recorder | PVR—Personal Video Recorder
• Preboot Execution Environment | PXE—Preboot Execution Environment
• PCI eXtensions for Instrumentation | PXI—PCI eXtensions for Instrumentation

• Quad Data Rate SRAM | QDR—Quad Data Rate
• Quality control | QA—Quality Assurance
• Quad Flat Package | QFP—Quad Flat Package
• Quality of service | QoS—Quality of Service
• QOTD—Quote of the Day
• Qt (toolkit) | Qt—Quasar Toolkit
• Queued teleprocessing access method | QTAM—Queued Teleprocessing Access Method
• Quarter Small Outline Package | QSOP—Quarter Small Outline Package
• Quality Windows Audio/Video Experience | qWave—Quality Windows Audio/Video Experience

• RACF—Resource Access Control Facility
• Rapid application development | RAD—Rapid Application Development
• RADIUS—Remote Authentication Dial In User Service
• RAID—Redundant Array of Independent Disks
• Resource Acquisition Is Initialization | RAII—Resource Acquisition Is Initialization
• RAID | RAIT—Redundant Array of Inexpensive Tapes
• Random-access memory | RAM—Random Access Memory
• Reverse Address Resolution Protocol | RARP—Reverse Address Resolution Protocol
• Reliability, availability and serviceability (computer hardware) | RAS—Reliability, Availability and Serviceability
• remote access service | RAS—Remote access service
• DVD region code | RC—Region Code
• Release Candidate | RC—Release Candidate
• Run commands | RC—Run Commands
• Revision Control System | RCS—Revision Control System
• Remote desktop software | RD—Remote Desktop
• remove directory | rd—remove directory
• Relational database management system | RDBMS—Relational Database Management System
• Remote Desktop Connection | RDC—Remote Desktop Connection
• Resource Description Framework | RDF—Resource Description Framework
• Relational data model | RDM—Relational Data Model
• RTOS | RDOS—Real-time Disk Operating System
• Remote Desktop Protocol | RDP— Remote Desktop Protocol
• Remote Data Services | RDS—Remote Data Services
• Refal | REFAL—Recursive Functions Algorithmic Language
• Representational State Transfer | REST—Representational State Transfer
• Regular expression | regex—Regular Expression
• Regular expression | regexp—Regular Expression
• Radio frequency | RF—Radio Frequency
• Request for Comments | RFC—Request For Comments
• Radio frequency interference | RFI—Radio Frequency Interference
• Radio-frequency identification | RFID—Radio Frequency Identification
• RGB color model | RGB—Red, Green, Blue
• RGBA—Red, Green, Blue, Alpha
• Red Hat Linux | RHL—Red Hat Linux
• Red Hat Enterprise Linux | RHEL—Red Hat Enterprise Linux
• Rich Internet application | RIA—Rich Internet Application
• Recording Industry Association of America | RIAA—Recording Industry Association of America
• Raster image processor | RIP—Raster Image Processor
• Routing Information Protocol | RIP—Routing Information Protocol
• Regional Internet registry | RIR—Regional Internet registry
• Reduced instruction set computer | RISC—Reduced Instruction Set Computer
• RISC OS—Reduced Instruction Set Computer Operating System
• Remote job entry | RJE—Remote Job Entry
• Run-length encoding | RLE—Run-Length Encoding
• Run-length limited | RLL—Run-Length Limited
• remove directory | rmdir—remove directory
• Java remote method invocation | RMI—Remote Method Invocation
• Richard Stallman | RMS—Richard Matthew Stallman
• Read-only memory | ROM—Read Only Memory
• S-LINK | ROMB—Read-Out Motherboard
• ROM-DOS—Read Only Memory - Disk Operating System
• Remote procedure call | RPC—Remote Procedure Call
• IBM RPG | RPG—Report Program Generator
• RPM Package Manager | RPM—RPM Package Manager
• Routing and Remote Access Service | RRAS—Routing and Remote Access Service
• RSA (algorithm) | RSA—Rivest Shamir Adleman
• Repetitive strain injury | RSI—Repetitive Strain Injury
• Radio Service Software | RSS—Radio Service Software
• RSS—Rich Site Summary, RDF Site Summary, or Really Simple Syndication
• RTAI—Real-Time Application Interface
• Real-time clock | RTC—Real-Time Clock
• Real-time business intelligence | RTE—Real-Time Enterprise
• RTEMS—Real-Time Executive for Multiprocessor Systems
• Bi-directional text | RTL—Right-to-Left
• Real-time operating system | RTOS—Real-Time Operating System
• Real-time Transport Protocol | RTP—Real-time Transport Protocol
• Flow control (data) | RTS—Ready To Send
• Real Time Streaming Protocol | RTSP—Real Time Streaming Protocol
• Run-time type information | RTTI—Run-time Type Information
• Responsive Web Design | RWD—Responsive Web Design

• Software as a service | SaaS—Software as a Service
• Security Account Manager | SAM— Security Account Manager
• Storage area network | SAN—Storage Area Network
• Serial attached SCSI | SAS—Serial attached SCSI
• Serial ATA | SATA—Serial ATA
• Simple API for XML | SAX—Simple API for XML
• Spinning beachball of death | SBOD—Spinning Beachball of Death
• Serial Bus Protocol 2 | SBP-2—Serial Bus Protocol 2
• sbin—superuser binary
• Windows Small Business Server | sbs—Small Business Server
• Standard Build Unit | SBU—Standard Build Unit
• SCADA—Supervisory Control And Data Acquisition
• Source Code in Database | SCID—Source Code in Database
• Software configuration management | SCM—Software Configuration Management
• Revision control | SCM—Source Code Management
• Secure copy | SCP—Secure Copy
• Single channel per carrier | SCPC—Single Channel Per Carrier
• Standard Commands for Programmable Instruments | SCPI—Standard Commands for Programmable Instrumentation
• Secure Content Storage Association | SCSA—Secure Content Storage Association
• SCSI—Small Computer System Interface
• Stream Control Transmission Protocol | SCTP—Stream Control Transmission Protocol
• Secure Digital | SD—Secure Digital
• SDDL—Security Descriptor Definition Language
• Synchronous Digital Hierarchy | SDH—Synchronous Digital Hierarchy
• Single document interface | SDI—Single Document Interface
• Single Edge Contact | SEC—Single Edge Contact
• Secure Digital | SDIO—Secure Digital Input Output
• Software development kit | SDK—Software Development Kit
• Simple DirectMedia Layer | SDL—Simple DirectMedia Layer
• Service Delivery | SDN—Service Delivery Network
• Session Description Protocol | SDP—Session Description Protocol
• Software-defined radio | SDR—Software-Defined Radio
• Synchronous dynamic random access memory | SDRAM—Synchronous Dynamic Random Access Memory
• Symmetric digital subscriber line | SDSL—Symmetric DSL
• Single-ended signalling | SE—Single Ended
• Software Engineering Institute | SEI—Software Engineering Institute
• Search engine optimization | SEO—Search Engine Optimization
• FTP over SSH | SFTP—Secure FTP
• Simple File Transfer Protocol | SFTP—Simple File Transfer Protocol
• SSH file transfer protocol | SFTP—SSH File Transfer Protocol
• Silicon Graphics | SGI—Silicon Graphics, Incorporated
• Standard Generalized Markup Language | SGML—Standard Generalized Markup Language
• graphics | SGR—Select Graphic Rendition
• Secure Hash Algorithm | SHA—Secure Hash Algorithm
• Single-pair high-speed digital subscriber line | SHDSL—Single-pair High-speed Digital Subscriber Line
• SIGCAT—Special Interest Group on CD-ROM Applications and Technology
• SIGGRAPH—Special Interest Group on Graphics
• SIMD—Single Instruction, Multiple Data
• SIMM—Single Inline Memory Module
• Session Initiation Protocol | SIP—Session Initiation Protocol
• Supplementary Ideographic Plane | SIP—Supplementary Ideographic Plane
• SISD—Single Instruction, Single Data
• Single-Input and Single-Output | SISO—Single-Input and Single-Output
• SUSE Linux Enterprise Desktop | SLED—SUSE Linux Enterprise Desktop
• SUSE Linux Enterprise Server | SLES—SUSE Linux Enterprise Server
• Scalable Link Interface | SLI—Scalable Link Interface
• Serial Line Internet Protocol | SLIP—Serial Line Internet Protocol
• Service Level Management | SLM—Service Level Management
• Source lines of code | SLOC—Source Lines of Code
• Subject Matter Expert | SME—Subject Matter Expert
• Single-mode optical fiber | SMF—Single-Mode (optical) Fiber
• Software project management | SPM—Software project management
• SPMD—Single Program, Multiple Data
• SMA connector | SMA—SubMiniature version A
• Server Message Block | SMB—Server Message Block
• System Management BIOS | SMBIOS—System Management BIOS
• Synchronized Multimedia Integration Language | SMIL—Synchronized Multimedia Integration Language
• S/MIME—Secure/Multipurpose Internet Mail Extensions
• Supplementary Multilingual Plane | SMP—Supplementary Multilingual Plane
• Symmetric multiprocessing | SMP—Symmetric Multi-Processing
• Switched-mode power supply | SMPS—Switch Mode Power Supply
• SMS—Short Message Service
• System Management Server | SMS—System Management Server
• Simultaneous multithreading | SMT—Simultaneous Multithreading
• Simple Mail Transfer Protocol | SMTP—Simple Mail Transfer Protocol
• IBM Systems Network Architecture | SNA—Systems Network Architecture
• Simple Network Management Protocol | SNMP—Simple Network Management Protocol
• SNTP—Simple Network Time Protocol
• Service-oriented architecture | SOA—Service-Oriented Architecture
• SOAP—Simple Object Access Protocol
• Symbolic Optimal Assembly Program | SOAP—Symbolic Optimal Assembly Program
• Stop Online Piracy Act | SOPA—Stop Online Piracy Act
• System-on-a-chip | SoC—System-on-a-Chip
• SO-DIMM—Small Outline DIMM
• Standard Operating Environment | SOE—Standard Operating Environment
• Small office/home office | SOHO—Small Office/Home Office
• Silicon on insulator | SOI—Silicon On Insulator
• Service pack | SP—Service Pack
• Single-page application | SPA—Single Page Application
• Sender Policy Framework | SPF—Sender Policy Framework
• Serial Peripheral Interface Bus | SPI—Serial Peripheral Interface
• Stateful Packet Inspection | SPI—Stateful Packet Inspection
• SPARC—Scalable Processor Architecture
• SQL—Structured Query Language
• Static random access memory | SRAM—Static Random Access Memory
• Static single assignment form | SSA—Static Single Assignment
• V-Model (software development) | SSD—Software Specification Document
• Solid-state drive | SSD—Solid-State Drive
• Simple Service Discovery Protocol | SSDP—Simple Service Discovery Protocol
• Streaming SIMD Extensions | SSE—Streaming SIMD Extensions
• Secure Shell | SSH—Secure Shell
• Server Side Includes | SSI—Server Side Includes
• Single-system image | SSI—Single-System Image
• Small Scale Integration | SSI—Small-Scale Integration
• Service set (802.11 network) | SSID—Service Set Identifier
• Secure Sockets Layer | SSL—Secure Socket Layer
• Single Sign On | SSO—Single Sign On
• Supplementary Special-purpose Plane | SSP—Supplementary Special-purpose Plane
• Streaming SIMD Extensions | SSSE—Supplementary Streaming SIMD Extensions
• Single-source shortest paths | SSSP—Single Source Shortest Path
• Secure Socket Tunneling Protocol | SSTP—Secure Socket Tunneling Protocol
• su (Unix) | su—superuser
• Single UNIX Specification | SUS—Single UNIX Specification
• SUSE Linux | SUSE—Software und System-Entwicklung
• Scalable Video Coding | SVC—Scalable Video Coding
• Scalable Vector Graphics | SVG—Scalable Vector Graphics
• Super Video Graphics Array | SVGA—Super Video Graphics Array
• Structured VLSI design | SVD—Structured VLSI Design
• Adobe Flash | SWF—Shock Wave Flash
• Standard Widget Toolkit | SWT—Standard Widget Toolkit
• Sysop—System operator

• Optical disc recording modes | TAO—Track-At-Once
• Telephony Application Programming Interface | TAPI—Telephony Application Programming Interface
• Turbo Assembler | TASM—Turbo ASseMbler
• Terabyte | TB—TeraByte
• Tcl—Tool Command Language
• Transmission Control Protocol | TCP—Transmission Control Protocol
• Internet Protocol Suite | TCP/IP—Transmission Control Protocol/Internet Protocol
• Telecommunication Control Unit | TCU—Telecommunication Control Unit
• Time-division multiple access | TDMA—Time-Division Multiple Access
• Thin-film transistor | TFT—Thin-Film Transistor
• tif- image(Tagged Image File Format)
• TFTP—Trivial File Transfer Protocol
• Texas Instruments | TI—Texas Instruments
• Three-letter acronym | TLA—Three-Letter Acronym
• Top-level domain | TLD—Top-Level Domain
• Thread-local storage | TLS—Thread-Local Storage
• Transport Layer Security | TLS—Transport Layer Security
• Type-length-value | TLV—Type-length-value
• /var/run | tmp—temporary
• Terminal node controller | TNC—Terminal Node Controller
• TNC connector | TNC—Threaded Neill-Concelman connector
• Transaction Processing Facility | TPF—Transaction Processing Facility
• Trusted Platform Module | TPM—Trusted Platform Module
• TRON command | TROFF—Trace Off
• TRON command | TRON—Trace On
• TRON Project | TRON—The Real-time Operating system Nucleus
• TRSDOS—Tandy Radio Shack - Disk Operating System
• Time Sharing Option | TSO—Time Sharing Option
• Travelling salesman problem | TSP—Traveling Salesman Problem
• Terminate and Stay Resident | TSR—Terminate and Stay Resident
• TTA (codec) | TTA—True Tap Audio
• TrueType | TTF—TrueType Font
• Transistor–transistor logic | TTL—Transistor-Transistor Logic
• Time to live | TTL—Time To Live
• Speech synthesis | TTS—Text-to-Speech
• Computer terminal | TTY—Teletype
• Tucows | TUCOWS—The Ultimate Collection of Winsock Software
• Community | TUG—TeX Users Group
• TWAIN—Technology Without An Interesting Name

• UAAG—User Agent Accessibility Guidelines
• User Account Control | UAC—User Account Control
• Universal asynchronous receiver/transmitter | UART—Universal Asynchronous Receiver/Transmitter
• User Acceptance Testing | UAT—User Acceptance Testing
• Universal Character Set | UCS—Universal Character Set
• Universal Description Discovery and Integration | UDDI—Universal Description, Discovery, and Integration
• UDMA—Ultra DMA
• User Datagram Protocol | UDP—User Datagram Protocol
• UEFI—Unified Extensible Firmware Interface
• Ultra high frequency | UHF—Ultra High Frequency
• User interface | UI—User Interface
• Upload | UL—Upload
• Gate array | ULA—Uncommitted Logic Array
• Upper memory area | UMA—Upper Memory Area
• Upper memory area | UMB—Upper Memory Block
• Unified Modeling Language | UML—Unified Modeling Language
• User-mode Linux | UML—User-Mode Linux
• Ultra-Mobile PC | UMPC—Ultra-Mobile Personal Computer
• Universal Mobile Telecommunications System | UMTS—Universal Mobile Telecommunications System
• Universal Naming Convention | UNC—Universal Naming Convention
• UNIVAC—Universal Automatic Computer (By MKS)
• Uninterruptible power supply | UPS—Uninterruptible Power Supply
• Uniform Resource Identifier | URI—Uniform Resource Identifier
• Uniform Resource Locator | URL—Uniform Resource Locator
• Uniform Resource Name | URN—Uniform Resource Name
• Universal Serial Bus | USB—Universal Serial Bus
• /usr | usr—user
• U.S. Robotics | USR—U.S. Robotics
• Coordinated Universal Time | UTC—Coordinated Universal Time
• Unicode | UTF—Unicode Transformation Format
• Unshielded twisted pair | UTP—Unshielded Twisted Pair
• UMTS Terrestrial Radio Access Network | UTRAN—Universal Terrestrial Radio Access Network
• UUCP—Unix to Unix Copy
• Universally Unique Identifier | UUID—Universally Unique Identifier
• Universal User Name | UUN—Universal User Name
• Universal Virtual Computer | UVC—Universal Virtual Computer
• Universal Windows Platform | UWP—Universal Windows Platform
• User experience design | UX—User Experience

• Filesystem Hierarchy Standard | var—variable
• VAX—Virtual Address eXtension
• DOS Protected Mode Interface | VCPI—Virtual Control Program Interface
• Virtual reality | VR—Virtual Reality
• VRML—Virtual Reality Modeling Language
• Visual Basic | VB—Visual Basic
• Visual Basic for Applications | VBA—Visual Basic for Applications
• VBScript | VBS—Visual Basic Script
• Desktop virtualization | VDI—Virtual Desktop Infrastructure
• Virtual DOS machine | VDM— Virtual DOS machine
• Very high bitrate digital subscriber line | VDSL—Very High Bitrate Digital Subscriber Line
• VESA—Video Electronics Standards Association
• File Allocation Table | VFAT—Virtual FAT
• Virtual Hard Disk | VHD — Virtual Hard Disk
• Virtual file system | VFS—Virtual File System
• Logical volume management | VG—Volume Group
• Video Graphics Array | VGA—Video Graphics Array
• Very high frequency | VHF—Very High Frequency
• Virtual LAN | VLAN—Virtual Local Area Network
• VLSM—Variable Length Subnet Mask
• VESA Local Bus | VLB—Vesa Local Bus
• Very low frequency | VLF—Very Low Frequency
• Very long instruction word | VLIW—Very Long Instruction Word
• Very-large-scale integration | VLSI—Very-Large-Scale Integration
• Virtual machine | VM—Virtual Machine
• Virtual memory | VM—Virtual Memory
• Hypervisor | VMM—Virtual Machine Monitor
• VNC—Virtual Network Computing
• Video on demand | VOD—Video On Demand
• Voice over Internet Protocol | VoIP—Voice over Internet Protocol
• Virtual private network | VPN—Virtual Private Network
• Graphics processing unit | VPU—Visual Processing Unit
• Virtual storage access method | VSAM—Virtual Storage Access Method
• Very small aperture terminal | VSAT—Very Small Aperture Terminal
• VT100 | VT—Video Terminal?
• Virtual Tape Library | VTL— Virtual Tape Library
• Virtual telecommunications access method | VTAM—Virtual Telecommunications Access Method
• Video Random Access Memory | VRAM—Video Random Access Memory

• World Wide Web Consortium | W3C—World Wide Web Consortium
• Apple Worldwide Developers Conference | WWDC—Apple Inc. | Apple World Wide Developer Conference
• Wide area file services | WAFS—Wide Area File Services
• Web Accessibility Initiative | WAI—Web Accessibility Initiative
• Wide area information server | WAIS—Wide Area Information Server
• Wide area network | WAN—Wide Area Network
• Wireless access point | WAP—Wireless Access Point
• Wireless Application Protocol | WAP—Wireless Application Protocol
• Open Watcom Assembler | WASM—Watcom ASseMbler
• Web-Based Enterprise Management | WBEM—Web-Based Enterprise Management
• Web Content Accessibility Guidelines | WCAG—Web Content Accessibility Guidelines
• Windows Communication Foundation | WCF—Windows Communication Foundation
• Wavelength-division multiplexing | WDM—Wavelength-Division Multiplexing
• WebDAV—WWW Distributed Authoring and Versioning
• Wired Equivalent Privacy | WEP—Wired Equivalent Privacy
• Interrupt | WFI—Wait For Interrupt
• WiMAX—Worldwide Interoperability for Microwave Access
• WinFS—Windows Future Storage
• Windows RunTime | WinRT—Windows RunTime
• Windows Internet Name Service | WINS—Windows Internet Name Service
• Wireless LAN | WLAN—Wireless Local Area Network
• Windows Media Audio | WMA—Windows Media Audio
• Windows Management Instrumentation | WMI— Windows Management Instrumentation
• Windows Media Video | WMV—Windows Media Video
• Windows Push Notification Service | WNS—Windows Push Notification Service
• Wake-on-LAN | WOL—Wake-on-LAN
• Wake-on-ring | WOR—Wake-on-Ring
• Write once, run anywhere | WORA—Write once, run anywhere
• Write once, run anywhere | WORE—Write once, run everywhere
• Wi-Fi Protected Access | WPA—Wi-Fi Protected Access
• Web Proxy Autodiscovery Protocol | WPAD—Web Proxy Autodiscovery Protocol
• Personal area network | WPAN—Wireless Personal Area Network
• Windows Presentation Foundation | WPF—Windows Presentation Foundation
• WS-Discovery | WS-D—Web Services-Discovery
• Web Services Description Language | WSDL—Web Services Description Language
• Web Services Flow Language | WSFL—Web Services Flow Language
• Wireless USB | WUSB—Wireless Universal Serial Bus
• Wireless Wide Area Network | WWAN—Wireless Wide Area Network
• World Wide Name | WWID—World Wide Identifier
• World Wide Name | WWN—World Wide Name
• World Wide Web | WWW—World Wide Web
• WYSIWYG—What You See Is What You Get
• Wireless Zero Configuration | WZC—Wireless Zero Configuration

• XML Accessibility Guidelines | XAG—XML Accessibility Guidelines
• Extensible Application Markup Language | XAML—eXtensible Application Markup Language
• X Display Manager (implementation) | XDM—X Window Display Manager
• X display manager (program type) | XDMCP—X Display Manager Control Protocol
• XCBL—XML Common Business Library
• XHTML—eXtensible Hypertext Markup Language
• Xilp (Unix software) | XILP—X Interactive ListProc
• XML—eXtensible Markup Language
• XMMS—X Multimedia System
• Extensible Messaging and Presence Protocol | XMPP—eXtensible Messaging and Presence Protocol
• Extended memory | XMS—Extended Memory Specification
• Xerox Network Systems | XNS—Xerox Network Systems
• Cross-platform | XP—Cross-Platform
• Extreme Programming | XP—Extreme Programming
• XPCOM—Cross Platform Component Object Model
• XPInstall | XPI—XPInstall
• Interface description language | XPIDL—Cross-Platform IDL
• Open XML Paper Specification | XPS— XML Paper Specification
• XML Schema (W3C) | XSD—XML Schema Definition
• Extensible Stylesheet Language | XSL—eXtensible Stylesheet Language
• XSL Formatting Objects | XSL-FO—eXtensible Stylesheet Language Formatting Objects
• XSL Transformations | XSLT—eXtensible Stylesheet Language Transformations
• Cross-site scripting | XSS—Cross-Site Scripting
• eXtensible Tag Framework | XTF—eXtensible Tag Framework
• eXtended Triton Format | XTF—eXtended Triton Format
• XUL—XML User Interface Language
• XVGA—Extended Video Graphics Adapter

• Year 2000 problem | Y2K—Year Two Thousand
• YAAF—Yet Another Application Framework
• Yacc | YACC—Yet Another Compiler Compiler
• YAML—YAML Ain't Markup Language
• YaST—Yet another Setup Tool

• Zone bit recording | ZCAV—Zone Constant Angular Velocity
• Zero code suppression | ZCS—Zero Code Suppression
• Zero insertion force | ZIF—Zero Insertion Force
• Zero insertion force | ZIFS—Zero Insertion Force Socket
• Zip (file format) | ZIP—ZIP file archive
• Zero instruction set computer | ZISC—Zero Instruction Set Computer
• Zero One Infinity | ZOI—Zero One Infinity
• Zope | ZOPE—Z Object Publishing Environment
• Zone Multicast Address | ZMA—Zone Multicast Address
• ZPL (programming language) | ZPL—Z-level Programming Language

• Acronym
• List of file formats
• List of information technology initialisms

• http://www.all-acronyms.com

• The UNIX Acronym List