U2B - User-to-Business
U2D - User-to-Data
U2OB - User-to-Online-Buying
U2U - User-to-User
UA - Unnumbered Acknowledgement
UA - User Agent
UAA - Unified Audio Architecture
UAAG - User Agent Accessibility Guidelines
UAB - UNIX® AppleTalk Bridge
UAC - Universal Access Concentrator
UAC - Universal Access Control
UAC - User Agent Client
UADPS - Uniform Automated Data Processing System
UADSL - Universal Asymmetric Digital Subscriber Line
UAE - Unrecoverable Application Error
UAEDT - Unrecoverable Application Error Debugging Tool
UAF - User Authorization File
UAM - Unified Authentication Model
UAM - Universal Access Method
UAN - Universal Application Network
UAP - Upgrade Advantage Program
UAPDU - User Agent Protocol Data Unit
UART - Universal Asynchronous Receiver/Transmitter
UAS - UnAvailable Seconds
UAS - User Agent Server
UAT - User Acceptance Testing
UAWG - Universal ADSL Working Group
UB - Ungermann-Bass
UBA - UniBus Adapter
UBE - Unsolicited Bulk E-mail
UBF - University Be Free
UBL - Universal Business Language
UBNI - Ungermann-Bass Network Interface
UBR - Unspecified Bit Rate
UC - Unified Communications
UCB - Unit Control Block
UCC - Unified Communication Center
UCC - Uniform Code Council
UCD - User Centered Design
UCE - Unsolicited Commercial E-mail
UCERT - Unisys Computer Emergency Response Team
UCF - Universal Communications Facility
UCI - Universal Connector Interface
UCITA - Uniform Computer Information Transactions Act
UCL - UCL Compression Library
UCLP - Universal Commerce Language and Protocol
UCM - Universal Call Model
UCP - Universal Computer Protocol
UCP - Universal Control Point
UCR - Under Color Removal
UCS - Unicode Character System
UCS - Universal Character Set
UCS - User Control System
UDA - Unified Driver Architecture
UDA - Universal Data Access
UDB - Universal DataBase
UDB - User DataBase
UDC - Universal Display Corporation
UDC - Utility Data Center
UDDI - Universal Description, Discovery, and Integration
UDEF - Universal Data Element Framework
UDF - Universal Disk Format
UDF - User-Defined Function
UDFS - Universal Disk File System
UDI - Universal Debug Interface
UDL - Universal Data Link
UDLD - UniDirectional Link Detection
UDLP - UniDirectional Link Protocol
UDMA - Ultra Direct Memory Access
UDO - User-Defined Object
UDP - Usenet Death Penalty
UDP - User Datagram Protocol
UDRP - Uniform domain-name Dispute-Resolution Policy
UDSL - Unindirectional Digital Subscriber Line
UDSL - Universal Digital Subscriber Line
UDT - Unstructured Data Transfer
UDT - User-Defined Type
UDU - UMA Data Unit
UDVM - Universal Data Voice Multiplexer
UE - Universal Explorer
UE - User Equipment
UETA - Uniform Electronic Transactions Act
UEV - User End of Volume
UFP - URL Filtering Protocol
UFS - Universal File System
UFS - UNIX File System
UFST - Universal Font Scaling Technology
UHCI - Universal Host Controller Interface
UHE - Ultra High Efficiency
UHF - Ultra High Frequency
UHP - Ultra High Performance
UI - Unit Interval
UI - UNIX International
UI - Unnumbered Information
UI - User Interface
UIC - UPnP Implementers Corporation
UIC - User ID Code
UICC - USIM Integrated Circuit Card
UID - User ID
UIDL - Unique ID Listing