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U
- U-maticVideocassette format; the first of its kind
- U-NetType of convolutional neural network
- Ubiquitous computingConcept in software engineering and computer science
- UbuntuLinux distribution developed by Canonical
- Ubuntu EdgeProposed smartphone
- Ubuntu TouchMobile interface for Ubuntu developed by UBports
- UCBLogoLogo programming language dialect
- UEFITechnical specification for firmware architecture
- Uganda Broadcasting CorporationPublic broadcaster network
- UKOLNFormerly known as The United Kingdom Office for Library and Information Networking, UKOLN
- UKUSA AgreementMultilateral signals intelligence treaty signed in 1946
- Ultra (cryptography)British designation for intelligence from decrypted enemy communications
- Ultra HD Blu-rayOptical disc storage medium
- Ultra HD ForumUltra HD Forum is an organization whose goal is to help solve the real world hurdles in de
- Ultra-high-definition television4K and 8K digital video formats
- UltraRAMStorage device technology
- UltraSPARC IIThe UltraSPARC II, code-named "Blackbird", is a microprocessor implementation of the SPARC
- Umbrella antennaMonopole antenna
- UML toolA UML tool (Unified Modeling Language tool) is a software application that supports some o
- UMTS frequency bandsThe UMTS frequency bands are radio frequencies used by third generation (3G) wireless Univ
- UN/CEFACTUN/CEFACT is the United Nations Centre for Trade Facilitation and Electronic Business. It
- Unbalanced oil and vinegar schemePost-quantum digital signature scheme
- UnbundlingUnbundling is the process of breaking up packages of products and services that were previ
- Undefined valueIn computing (particularly, in programming), undefined value is a condition where an expre
- UndersamplingSignal processing sample technique
- Understand (software)Understand is a customizable integrated development environment (IDE) that enables static
- UndoComputer command
- UnicodeCharacter encoding standard
- Unicode and HTMLRelationship between Unicode characters and HTML
- Unicode fontComputer font that maps glyphs to code points defined in the Unicode Standard
- UNICOSUNICOS is a range of Unix and later Linux operating system (OS) variants developed by Cray
- Unified communicationsUnified communications (UC) is a business and marketing concept describing the integration
- Unified Modeling LanguageSoftware design modeling notation
- Unified processObject oriented software development process framework
- Uniform Resource IdentifierString used to identify a name of a web or internet resource
- Uniform Resource NameUniform Resource Identifier that uses the urn scheme
- Uniform Type IdentifierString used for identify objects on Apple subsystems
- Union mountIn computer operating systems, union mounting is a way of combining multiple directories i
- Union typeData type that allows for values that are one of multiple different data types
- Unique identifierIdentifier that is unique among all used identifiers
- Uniqueness typeConcept in computing
- Unit 8200Intelligence unit of the Israel Defense Forces
- Unit prefixIndicates multiples or fractions of a unit
- Unit priceAverage price of a product
- Unit record equipmentElectromechanical machines which processed data using punch cards
- Unit testingValidating the behavior of isolated source code
- Unit typeType that allows only one value
- United States Air Force in the United KingdomSince 1942 the United States has maintained air bases in the United Kingdom. Major Command
- United States Cyber CommandArmed Forces responsible for cyberwarfare
- United States House Committee on the JudiciaryStanding committee of the United States House of Representatives
- United States National Security CouncilFederal executive national security and intelligence forum
- United States Senate Select Committee on IntelligenceLegislative committee
- UNIVACSeries of mainframe computer models
- UNIVAC 490Computer designed in the early 1960s
- UNIVAC IFirst general-purpose computer designed for business application (1951)
- UNIVAC IIThe UNIVAC II computer was an improvement to the UNIVAC I that the UNIVAC division of Sper
- Universal Coded Character SetStandard set of characters defined by ISO/IEC 10646
- Universal Disk FormatVendor-neutral file system, used in practice for DVDs and other optical discs
- Universal Flash StorageFlash storage specification
- Universal integrated circuit cardSmart card used to uniquely identify a mobile device on a cellular network
- Universal memoryProposed form of computer storage
- Universal Mobile SystemsUniversal Mobile Systems (UMS), dba mobiuz, is an Uzbek–Russian telecommunications company
- Universal Product CodeBarcode system for tracking trade items
- Universal Service FundAmerican system of telecommunications subsidies and fees
- Universally unique identifier128-bit number used to identify information in computer systems
- Unix filesystemDirectory structure used by a Unix-like operating system
- Unix philosophySoftware development philosophy
- Unix shellCommand-line interpreter for Unix operating system
- Unix timeDate and time representation system widely used in computing
- Unix-likeOperating system that behaves similarly to Unix
- Unladen SwallowBranch of computer programming language
- Unreal modeIn x86 computing, unreal mode, also big real mode, flat real mode, or voodoo mode is a var
- Unstructured Supplementary Service DataUnstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or
- UnxUtilsUnxUtils is a collection of ports of common GNU Unix-like utilities to native Win32, with
- UploadComputer file operation
- UpsamplingDigital signal resampling method
- Upstream collectionTerm used by the National Security Agency
- UptimePeriod when a computer system is available
- URLAddress on the World Wide Web
- URL shorteningWeb technique
- USA Freedom Act2015 U.S. surveillance law
- UsabilityCapacity of a system for its users to perform tasks
- Usage share of BitTorrent clientsThe usage share of BitTorrent clients is the percentage of users that use a particular Bit
- Usage share of operating systemsRelative market adoption of operating systems
- Usage share of web browsersRelative market adoption of web browsers
- USBStandard for computer data connections
- USB 3.0Third major version of the Universal Serial Bus standard
- USB flash driveData storage device
- USB Implementers ForumOrganization that supports the USB standard
- USB-C24-pin USB connector system
- USB-to-serial adapterA USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used
- USB4Technical standard in computing
- Use casePotential scenario for use of a system
- Use of DNA in forensic entomologyForensic entomology has three sub-fields: urban, stored product and medico-criminal entomo
- Use-define chainWithin computer science, a use-definition chain (or UD chain) is a data structure that con
- UsenetWorldwide computer-based distributed discussion system
- Usenet newsgroupRepository within Usenet
- User (computing)Person who uses a computer or network service
- User Datagram ProtocolPrincipal protocol used for transmission of datagrams across an IP network
- User errorError made by the human user of a complex system
- User experienceHuman interaction with a particular product, system or service
- User interface designPlanned operator–machine interaction
- User profileData about an individual user
- User space and kernel spaceWay of using computer memory
- User-centered designFramework of processes with focus on users, uses, and tasks
- User-generated contentOnline content created by users
- Utah Data CenterNSA data storage facility
- UTF-1Obsolete multibyte encoding for Unicode
- UTF-16Variable-width encoding of Unicode, using one or two 16-bit code units
- UTF-32Encoding Unicode characters as 4 bytes per code point
- UTF-8ASCII-compatible variable-width encoding of Unicode
- UTF-EBCDICUTF-EBCDIC is a character encoding capable of encoding all 1,112,064 valid character code
- UUNETU.S. Internet service provider