U

UA

User Agent

UAC

Union Aerospace Corporation (Doom)

UAE

United Arab Emirates

UBR

Unfocused Boss Rambling (Dilbert)

UCC

Uniform Code Council, Inc.

UCS

Universal Character Set

UK

United Kingdom

UML

Unified Modeling Language (from HLN)

UMTS

Universal Mobile Telecommunications System

UN

United Nations

UNC

Uniform Naming Convention

UNHCR

UN High Council for Refugees

UPC

Universal Product Code (North American equivalent to European EAN)

UPC

Uniform Plumbing Code (IAPMO)

UPS

Uninterruptable Power Supply

UPS

United Parcel Service

URI

Universal Resource Identifier

URL

Universal Resource Locator

USA

United States of America

USB

Universal Serial Bus

UTC

Universal Time, Coordinated (=GMT)

UV

Ultra Violet