| U-RRM |
User Radio Resource Management (ict/net/mobile) |
| UA |
User Agent (org/itu/x400) |
| UBR |
Unspecified Bit Rate (ict/net) |
| UCC |
University College Cork (edu/ie) |
| UCD |
University College Dublin (edu/ie) |
| UCIF |
Unified Communications Interoperability Forum (org) |
| UCS |
Universal (multiple-octet coded) Character Set (ict/unicode) |
| UDDI |
Universal Description, Discovery, and Integration (ict/lang) |
| UDP |
User Datagram Protocol (org/ietf/ip) |
| UE |
User Equipment (org/3gpp) |
| UEPS |
Universal Executable Policy Specification (com/se/ericsson/nm-lab/upt) |
| UF |
Utility Function (ict/concept) |
| UHD |
Ultra-High Definition (ict/graphic) |
| UIC |
International Union of Railways (org) |
| UISF |
User Interface Support Function (org/itu/m3000) |
| UK Sim |
UK Society for Modelling and Simulation (org) |
| UL |
University of Limerick (edu/ie) |
| UME |
UNI Management Entity (org/itu/atm) |
| UML |
Unified Modeling Language (org/omg) |
| UMTS |
Universal Mobile Telecommunications System (org/3gpp/3g) |
| UMTS Forum |
Universal Mobile Telecommunications System Forum (org) |
| UNI |
User Network Interface (org/itu/atm) |
| UP |
User Plane (ict/net) |
| UPC |
Usage Parameter Control (org/itu/atm) |
| UPe |
Universal Policy Enginge (com/se/ericsson/nm-lab/upt) |
| UPec |
Universal Policy Engine Cluster (com/se/ericsson/nm-lab/upt) |
| UPEE |
Universal Policy Execution Environment (com/se/ericsson/nm-lab/upt) |
| UPM |
Universal Policy Model (com/se/ericsson/nm-lab/upt) |
| UPN |
User Principal Name (com/us/microsoft/ad) |
| UPNP |
Universal Plug and Play (ict/comp) |
| UPnP Forum |
Universal Plug and Play Forum (org) |
| UPS |
Uninterruptible Power Supply (ict/comp) |
| UPT |
Unifying Policy Theory (com/se/ericsson/nm-lab) |
| UPx |
Universal Policy Executor (com/se/ericsson/nm-lab/upt) |
| URI |
Uniform Resource Identifier (org/ietf/www) |
| URL |
Uniform Resource Locator (org/ietf/www) |
| URN |
Uniform Resource Name (org/ietf/www) |
| US |
Unit Separator (org/ansi/ascii) |
| USB |
Universal Serial Bus (ict/comp) |
| USB IF |
USB Implementers Forum (org) |
| USEC |
USer SEcurity (org/ietf/snmp) |
| USM |
User-based Security Model (org/ietf/snmp) |
| USN |
Update Sequence Number (com/us/microsoft/ad) |
| USR |
U.S. Robotics (com/us) |
| UT |
Universal Time (time) |
| UTC |
Coordinated Universal Time (time) |
| UTF |
UCS Transformation Format (ict/unicode) |
| UTF-16 |
UCS Transformation Format - 16 bit (ict/unicode) |
| UTF-8 |
UCS Transformation Format - 8 bit (ict/unicode) |
| UTOPIA |
Universal Test & Operations Physical layer Interface for ATM (org/itu/atm) |
| UUCP |
Unix to Unix Copy Protocol (ict/os/unix/commands) |
| UUID |
Universally Unified Identifier (ict) |