U...

• UA User Agent + User Area
• UAE Unrecoverable Application Error
• UAM User Authentication Method
• UART Universal Asynchronous Receiver/Transmitter
• UAS User Application Software
• UBR Unspecified Bit Rate
• .UC2 Compressed File (file name extension) [UltraCompressor]
• UCE Unsolicited Commercial Email
• UCL Universal Communications Language
• UCS Unicode Conversion Support + Universal Character Set + User Coordinate System
• UCT Universal Coordinated Time
• UDA Universal Data Access [Microsoft]
• UDB Universal Data Base
• UDC Universal Decimal Classification + User Defined Commands
• UDD User Data Document
• UDDI Universal Description, Discovery and Integration
• UD-DVD Ultra-Definition Digital Video Disk
• UDE Universal Data Exchange
• UDEC * Universal Digital Electronic Computer [Burroughs]
• UDF Universal Disk Format + User Defined Functions
• UDG User Defined Gateway
• UDMA Ultra Direct Memory Access
• UDP User Datagram Protocol
• UDT Uniform Data Transfer + User-Defined Type
• UFS Unix File System
• UG User Group
• UHCI Universal Host Controller Interface
• UHF Ultra-High Frequency
• UHL Universal Hypertext Link
• UI Unix International + User Interface
• UIC User Identification Code
• UID User Identifier
• UIMS User Interface Management System
• UL Underwriters Laboratories + Unordered List + Upload
• ULA Uncommitted Logic Array
• ULN Universal Link Negotiation
• ULSI Ultra Large Scale Integration
• UMA Unified Memory Architecture
• UMB Upper Memory Block [LIM/AST]
• UML Unified Modeling Language
• UMS User Mode Scheduler
• UMTS Universal Mobile Telecommunications System
• UNC Universal Naming Convention + Uuencoded Netnews Collator [Unix]
• UNCOL Universal Computed Oriented Language
• UNEP Unbundled Network Platform
• UNI User-Network Interface
• UNICOM Universal Integrated Communication (System)
• UNICOS Universal Compiler FORTRAN compatible
• UNII Unlicensed National Information Infrastructure
• UNIVAC Universal Automatic Computer
• UNIX (AT&T Bell Laboratories Operating System)
• UNMA Unified Network Management Architecture
• UNSPSC Universal Standard Products and Services Classification
• UP Uniprocessor
• UPC Universal Product/Program Code + User Parameter Control
• UPG Upgrade
• UPL User Program Language
• UPM Unix Programmer's Manual + User Profile Management [IBM]
• UPS Uninterruptible Power Supply/System
• URC Uniform Resource Characteristics + Uniform Resource Citation
• UREP Unix RSCS Emulation Protocol (protocol)
• URI Uniform Resource Identifier
• URL Uniform Resource Locator
• URN Uniform Resource Name/Number
• US Unit Separator
• USART Universal Synchronous-Asynchronous Receiver/Transmitter
• USB Universal Serial Bus [Intel]
• USENET User's Network [Internet]
• USERID User Identification
• USOC Universal Service Ordering Code
• USQ Unsqueezed (files)
• USR US Robotics (corporation)
• USRT Universal Synchronous Receiver/Transmitter
• USSA User Supported Software Association (United Kingdom)
• UT User Terminal
• UTC Coordinated Universal Time
• UTF Unicode Transformation Format
• UTI Universal Text Interchange/Interface
• UTP Unshielded Twisted-Pair (cable)
• UU Uuencode/Uudecode
• UUCP Unix-To-Unix Copy Protocol
• UUD UUDecoding [Unix]
• UUDECODE Unix-To-Unix Decoding
• UUE UUEncoding [Unix]
• UUENCODE Unix-To-Unix Encoding
• UUI User-To-User Information [AT&T]
• UUID Universal Unique Identifier
• UV Ultraviolet
• UWR Ultra Wideband Radio
• UXGA Ultra Extended Graphics Array