| Acronyms | Meaning / Significance | Source |
UA | User Agent | ITU-T recommendation X.400 | UA | User Area | | UAC | Upper Area
Control Center | | UAV | unmanned air
vehivle | | UAV | unmanned airial
vehicle | | UCI | unite de compte
internalional | | UD | user domain | | UDP | user data
protocol | STC CSNI final report 22/9/95 | UDP | user datagram
protocol | | UFO | UHF follow-on
programme | | UFV | user field
verification | ACCIS | UHF | Ultra High
Frequency | | UI | UNIX
international | | UIC | Unit
Identification Code | | UIDL | user interface
definition language | | UIMS | user interface
management system | | UISRM | user interface
system reference model | | UKADGE | United Kingdom
Air Defence Ground Environment | | ULA | Upper Layer
Architecture | | ULC | US Liaison Cell | | UMA | unmanned aircraft | | UMO | Unconventional
Military Operation | | UMP | universal modem
programme | | UMS | Universal Modem
System | | UMTS | universal mobile
telecommunications system | | UN | United Nations | | UNCTAD | UN Conference on
Trade and Development | | UNESCO | UN Educational,
Scientific and Cultural Organisation | | UNHCR | UN High
Commission for Refugees | | UNITER | part of RAFFTS
with switching and bulk encrypted 2MB links | | UNOCHA | UN Office for the Coordination of Humanitarian Affairs | | UNPROFOR | UN Protection Force | | UNSC | UN Security Council | | UPS | Uninterruptable
Power Supply | | US TACS | US Theater Air
Control System | | USA | United States of
America | | USD | User Service
Division | | USSP | US special
programme | financial
compensation | UTM | Universal Trans
Mercator | | UTP | Unshielded
Twisted Pair cable | | UWS | Universal
Workstation | |
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