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

0–9

0-day—Zero-day vulnerability 1GL—First-generation programming language 1NF—First normal form 10B2—10BASE-2 10B5—10BASE-5 10B-F—10BASE-F 10B-FB—10BASE-FB 10B-FL—10BASE-FL 10B-FP—10BASE-FP 10B-T—10BASE-T 100B-FX—100BASE-FX 100B-TX—100BASE-TX 100BVG—100BASE-VG 286—Intel 80286 processor 2B1Q—2 binary 1 quaternary 2FA—Two-factor authentication 2GL—Second-generation programming language 2NF—Second normal form 3DES—Triple Data Encryption Standard 3GL—Third-generation programming language 3GPP—3rd Generation Partnership Project – 3G comms 3GPP2—3rd Generation Partnership Project 2 3NF—Third normal form 386—Intel 80386 processor 486—Intel 80486 processor 4B5BLF—4-bit 5-bit local fiber 4GL—Fourth-generation programming language 4NF—Fourth normal form 5GL—Fifth-generation programming language 5NF—Fifth normal form 6NF—Sixth normal form 8B10BLF—8-bit 10-bit local fiber 802.11—wireless LAN 8D—Eight disciplines problem solving

A

A11Y—Accessibility AAA—Authentication, authorization, and accounting AABB—Axis-aligned bounding box AAC—Advanced Audio Coding AAL—ATM Adaptation Layer AALC—ATM Adaptation Layer Connection AARP—AppleTalk Address Resolution Protocol ABAC—Attribute-Based Access Control ABCL—Actor-Based Concurrent Language ABI—Application Binary Interface ABM—Asynchronous Balanced Mode ABR—Area Border Router ABR—Auto Baud-Rate detection ABR—Available Bitrate ABR—Average Bitrate ABR—Adaptive Bitrate (Streaming) AC—Acoustic Coupler AC—Alternating Current AC—Authorization certificate ACD—Automatic Call Distributor ACE—Advanced Computing Environment ACID—Atomicity Consistency Isolation Durability ACK—Acknowledgement ACK—Amsterdam Compiler Kit ACL—Access Control List ACL—Active Current Loop ACM—Association for Computing Machinery ACME—Automated Classification of Medical Entities ACP—Airline Control Program ACPI—Advanced Configuration and Power Interface ACR—Allowed Cell Rate ACR—Attenuation to Crosstalk Ratio AD—Active Directory AD—Administrative Domain ADC—Analog-to-Digital Converter ADC—Apple Display Connector ADB—Apple Desktop Bus ADCCP—Advanced Data Communications Control Procedures ACE—Advanced Computing Environment ADDS—Applied Digital Data Systems ADO—ActiveX Data Objects ADSL—Asymmetric Digital Subscriber Line ADT—Abstract Data Type AE—Adaptive Equalizer AE—Authenticated encryption AEAD—Authenticated encryption with associated data AES—Advanced Encryption Standard AF—Anisotropic Filtering AFIPS—American Federation of Information Processing Societies AFP—Apple Filing Protocol AGI—Artificial General Intelligence AGP—Accelerated Graphics Port AH—Active Hub AH—Authentication Header AHCI—Advanced Host Controller Interface AI—Artificial Intelligence AIS—Automated Indicator Sharing AIX—Advanced Interactive eXecutive Ajax—Asynchronous JavaScript and XML AL—Active Link AL—Access List ALAC—Apple Lossless Audio Codec ALE—Annualized loss expectancy ALGOL—Algorithmic Language ALSA—Advanced Linux Sound Architecture ALU—Arithmetic and Logical Unit AM—Access Method AM—Active Matrix AMOLED—Active-Matrix Organic Light-Emitting Diode AMQP—Advanced Message Queuing Protocol AM—Active Monitor AM—Allied Mastercomputer AM—Amplitude Modulation AMD—Advanced Micro Devices AMI—Amazon Machine Image AMQP—Advanced Message Queuing Protocol AMR—Audio Modem Riser ANN—Artificial Neural Network ANSI—American National Standards Institute ANT—Another Neat Tool AoE—ATA over Ethernet AOP—Aspect-Oriented Programming AOT—Ahead-Of-Time AP—Access point APCI—Application-Layer Protocol Control Information APFS—Apple File System API—Application Programming Interface APIC—Advanced Programmable Interrupt Controller APIPA—Automatic Private IP Addressing APL—A Programming Language APR—Apache Portable Runtime APT—Advanced persistent threat ARC—Adaptive Replacement Cache ARC—Advanced RISC Computing ARIN—American Registry for Internet Numbers ARIS—Architecture of Integrated Information Systems ARM—Advanced RISC Machines ARO—Annualized rate of occurrence AROS—AROS Research Operating System ARP—Address Resolution Protocol ARPA—Address and Routing Parameter Area ARPA—Advanced Research Projects Agency ARPANET—Advanced Research Projects Agency Network ART—Android Runtime AS—Access Server ASCII—American Standard Code for Information Interchange ASG—Abstract Semantic Graph ASK—Amplitude-shift keying ASIC—Application-Specific Integrated Circuit ASIMO—Advanced Step in Innovative Mobility ASLR—Address Space Layout Randomization ASM—Algorithmic State Machine ASMP—Asymmetric Multiprocessing ASN.1—Abstract Syntax Notation 1 ASP—Active Server Pages ASP—Application Service Provider ASR—Asynchronous Signal Routine AST—Abstract Syntax Tree AT—Advanced Technology AT—Access Time AT—Active Terminator ATA—Advanced Technology Attachment ATAG—Authoring Tool Accessibility Guidelines ATAPI—Advanced Technology Attachment Packet Interface ATM—Asynchronous Transfer Mode ATT&CK—Adversarial Tactics, Techniques, and Common Knowledge AUP—Acceptable use policy AuthIP—Authenticated Internet Protocol AuthN—Authentication AuthZ—Authorization AV—Antivirus software AVC—Advanced Video Coding AVI—Audio Video Interleaved AWK—Aho Weinberger Kernighan AWS—Amazon Web Services AWT—Abstract Window Toolkit

B

B2B—Business-to-Business B2C—Business-to-Consumer B2E—Business-to-Employee BaaS—Backend as a service BaaS—Banking as a service BaaS—Blockchain as a service BAL—Basic Assembly Language BAM—Block Availability Map BAN—Body area network BAS—Building automation systems Bash—Bourne-again shell BASIC—Beginner's All-Purpose Symbolic Instruction Code BBP—Baseband ProcessorCo BBS—Bulletin Board System BC—Business Continuity BCC—Blind Carbon Copy BCD—Binary Coded Decimal BCD—Boot Configuration Data BCNF—Boyce–Codd normal form BCP—Best Current Practice BCP—Business continuity planning BCS—British Computer Society BE—Backend BEEP—Blocks Extensible Exchange Protocol BER—Basic Encoding Rules BER—Bit Error Rate BFD—Bidirectional Forwarding Detection BFD—Binary File Descriptor BFS—Breadth-First Search BFT—Byzantine Fault Tolerant BGP—Border Gateway Protocol BI—Business Intelligence BIA—Business impact analysis BiDi—Bi-Directional bin—binary BINAC—Binary Automatic Computer BIND—Berkeley Internet Name Domain BIOS—Basic Input Output System BJT—Bipolar Junction Transistor bit—binary digit BLISS—Bimodal Lattice Signature Scheme Blob—Binary large object Blog—Web Log BMP—Basic Multilingual Plane BNC—Baby Neill Constant BOINC—Berkeley Open Infrastructure for Network Computing BOM—Byte Order Mark BOOTP—Bootstrap Protocol BPA—Oracle Business Process Analysis (BPA) Suite BPDU—Bridge Protocol Data Units BPEL—Business Process Execution Language BPL—Broadband over Power Lines BPM—Business Process Management BPM—Business Process Modeling bps—bits per second BRM—Business Reference Model BRMS—Business Rule Management System BRR—Business Readiness Rating BRS—Broadband Radio Service BSA—Business Software Alliance BSB—Backside Bus BSD—Berkeley Software Distribution BSoD—Blue Screen of Death BSS—Block Started by Symbol BT—BitTorrent BT—Bluetooth B TAM—Basic Telecommunications Access Method BURS—Bottom-up rewrite system BW—Bandwidth BYOD—Bring Your Own Device Byte—By eight (group of 8 bits)

C

CA—Certificate authority CA—Computer Associates International, Inc. CaaS—Content as a service CAD—Computer-aided design CAE—Computer-aided engineering CAID—Computer-aided industrial design CAI—Computer-aided instruction CAM—Computer-aided manufacturing CAN—Campus network CAP—Consistency availability partition tolerance (theorem) CAPA—Corrective and preventive actiont CAPI—Cryptographic Application Programming Interface CAPTCHA—Completely automated public Turing test to tell computers and humans apart CAQ—Computer-aided quality assurance CASB—Cloud access security broker CASE—Computer-aided software engineering CAT—Computer-aided translation Cat—Category rating CBC—Cipher block chaining CBC-MAC—Cipher block chaining message authentication code CBPRNG—Counter-based pseudo-random number generator CBRNG—Counter-based random number generator cc—C compiler CC—Carbon copy CC—Creative Commons CCE—Common Configuration Enumeration CCM—Central control module CCM—Cloud Controls Matrix CCM—Combined Cipher Machine CCMP—CCM mode Protocol CCTV—Closed-circuit television CCX—Cisco Compatible eXtensions CD—Compact Disc CDE—Common Desktop Environment CDMA—Code-division multiple access CDN—Content delivery network CDP—Cisco Discovery Protocol CDP—Continuous data protection CD-R—CD-Recordable CD-ROM—CD Read-Only Memory CD-RW—CD-Rewritable CDSA—Common Data Security Architecture CEI—Comparably efficient interconnection CER—Canonical Encoding Rules CERT—Computer emergency response team CES—Consumer Electronics Show CF—Compact Flash CFB—Cipher feedback CFD—Computational fluid dynamics CFF—Compact Font Format CFG—Context-free grammar CFG—Control-flow graph CG—Computer graphics CGA—Color graphics array CGI—Common Gateway Interface CGI—Computer-generated imagery CGT—Computational Graph Theory CHAP—Challenge-Handshake Authentication Protocol CHRP—Common Hardware Reference Platform CHS—Cylinder–head–sector CI/CD—Continuous integration (CI) and continuous delivery (CD) CICS—Customer Information Control System CIDR—Classless inter-domain routing CIFS—Common Internet Filesystem CIM—Common Information Model CIO—Chief information officer CIP—Critical infrastructure protection CIR—Committed information rate CIS—Center for Internet Security CIS—Centre for Internet and Society (India) CIS—Computer and information science CIS—Comodo Internet Security CIS—Contact image sensor CIS—Continuous ink system CISA—Cybersecurity and Infrastructure Security Agency CISC—Complex-instruction-set computer CISO—Chief information security officer CIT—Center for Information Technology CIT—Computer Information Technology CJK—Chinese, Japanese, and Korean CJKV—Chinese, Japanese, Korean, and Vietnamese CLI—Command line interface CLR—Common Language Runtime CM—Configuration management CM—Content management CMDB—Configuration management database CMM—Capability Maturity Model CMMI—Capability Maturity Model Integration CMOS—Complementary metal–oxide–semiconductor CMS—Content management system CN—Canonical Name CN—Common Name CNC—Computerized numerical control CNG—Cryptographic Next Generation CNR—Communications and Networking Riser CNRI—Corporation for National Research Initiatives Coax—Coaxial cabling COBOL—Common Business-Oriented Language COM—Component Object Model or communication ConfigMgr—Microsoft Configuration Manager COOP—Continuity of Operations COPE—Corporate-owned, personally enabled CORBA—Common Object Request Broker Architecture CORS—Cross-origin resource sharing COTS—Commercial off-the-shelf CPA—Cell processor architecture CPAN—Comprehensive Perl Archive Network CP/CMS—Control Program/Cambridge Monitor System CPF—Control Program Facility CP/M—Control Program/Monitor CPRI—Common Public Radio Interface CPS—Characters per second CPU—Central processing unit CQS—Command–query separation CQRS—Command Query Responsibility Segregation CR—Carriage return CRAN—Comprehensive R Archive Network CRC—Cyclic redundancy check CRL—Certificate revocation list CRLF—Carriage return line feed CRM—Customer Relationship Management CRS—Computer Reservations System CRT—Cathode-ray tube CRUD—Create, read, update, and delete CS—Cable Select CS—Computer science CSA—Cloud Security Alliance CSE—Computer science and engineering CSF—Cybersecurity Framework CSi—CompuServe CSI—Common System Interface CSM—Compatibility support module