UIL - User Interface Language
UIMA - Unstructured Information Management Architecture
UIML - User Interface Markup Language
UIMS - User Interface Management System
UIN - Universal Identification Number
UIN - User ID Number
UIO - Universal Input/Output
UIP - User Interface Process
UISA - User Instruction Set Architecture
UISRM - User Interface System Reference Model
UIT - United Internet Technologies
UITA - Utah Information Technology Association
UKERNA - United Kingdom Education and Research Networking Association
UKOLN - United Kingdom Office for Library and information Networking
UL - Underwriters Laboratories
ULA - Uncommitted Logic Array
ULA - Upper Layer Address
ULANA - Unified Local Area Network Architecture
ULCC - University of London Computer Centre
ULCP - UnitedLinux Certified Professional
ULF - Universal Location Framework
ULP - Upper Layer Protocol
ULPDU - Upper Layer Protocol Data Unit
ULSI - Ultra Large Scale Integration
ULSR - Unidirectional Line Switched Ring
ULV - Ultra Low Voltage
UM - Unified Messaging
UMA - Undeliverable Message Action
UMA - Unified Memory Architecture
UMA - Universal Measurement Architecture
UMADS - Universal Measurement Architecture Data Storage
UMB - Upper Memory Block
UMC - United Microelectronics Corporation
UME - UNI Management Entity
UML - Unified Modeling Language™
UML - User-Mode Linux
UMTS - Universal Mobile Telecommunications System
UMTS - Universal Mobile Telephone System
UNA - Universal Network Architecture
UNC - Universal Naming Convention
UNCID - UNiform rules of Conduct for Interchange of trade Data by teletransmission
UNCLE - UNIX Net for Computer security in Law Enforcement
UNGTDI - United Nations Guidelines for Trade Data Interchange
UNI - User Network Interface
UNIVAC - UNIVersal Automatic Computer
UNMA - Unified Network Management Architecture
UNS - Universal Naming Convention
UNSAF - UNilateral Self-Address Fixing
UNSM - United Nations Standard Message
UNTDED - United Nations Trade Data Elements Directory
UNTDID - United Nations Trade Data Interchange Directory
UNX - Universal Network Exchange
UODK - UnixWare and OpenServer Development Kit
UONE - Unified Open Network Exchange
UP - Uni-Processor
UPA - Ultra Port Architecture
UPAM - User Primary Access Method
UPB - Ultimate PHP Board
UPC - Ultra-Personal Computer
UPC - Universal Product Code
UPC - Usage Parameter Control
UPI - Universal Peripheral Interface
UPL - Universal Parsing Language
UPL - User Program Language
UPM - Universal Phantom Manager
UPM - User Profile Management
UPN - User Principal Name
UPnP - Universal Plug and Play
UPP - Universal Parallel Port
UPP - Universal Procedure Pointer
UPPS - Universal Portable Protocol Stack
UPS - Uninterruptable Power Supply
UPS - UNIX Product Support
UPSR - Unidirectional Path Switch Ring
UPT - Universal Personal Telecommunications
UPX - Ultimate Packer for eXecutables
UR - Unit Record
URA - Uniform Resource Agent
URB - USB Request Block
URC - Uniform Resource Characteristics
URC - Uniform Resource Citation
URI - Uniform Resource Identifier
URL - Uniform Resource Locator
URN - Uniform Resource Name
URSN - Unique Resource Serial Number
US - Unit Separator
USAGI - UniverSAl playGround for IPv6
USART - Universal Synchronous Asynchronous Receiver/Transmitter
USB - Universal Serial Bus
USCP - UNICOS Station Call Processor
USCW - Uncacheable Speculative Write Combining
USD - User's Supplementary Documents
USDC - Universal Switched Data Capability
USDN - United States Digital Network
USE - Unified Software Environment
USEC - User-based SECurity model
USENET - USEr NETwork
USF - Uplink State Flag
USG - UNIX Support Group
USG - User Support Group