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Abkürzung-Kategorie: u
| Abkürzung | Langform |
| USAN | University Satellite Network |
| USART | Universal Synchronous Asynchronous Receiver Transmitter |
| USB | Universal Serial Bus |
| USB | Upper Side Band |
| USC | University of Southern California |
| USC | Under Steering Control |
| USCG | United States Coast Guard |
| USDC | US Display Consortium |
| USEPA | United States Environmental Protection Agency |
| USF | Uplink State Flag |
| USG | UNIX Support/System Group (Novell) |
| USGS | United States Geological Survey |
| USHPD | Ultra Super High Performance Dieseloil |
| USIA | US Information Agency |
| USIM | Universal Subscriber Identification/Identity Module |
| USK | Unterhaltungssoftwareselbstkontrolle |
| USKA | Union Schweizer Kurzwellenamateure |
| USL | UNIX System Laboratories (AT+T, Novell) |
| USLE | UNIX System Laboratories Europe |
| USM | User-based Security Model |
| USN | Update Sequence Number |
| USO | UNIX Software Operation |
| USOC | Uniform Service Order Code |
| USRT | Universal Synchronous Receiver Transmitter |
| USSA | Universal Storage System Architecture |
| Ust.-IdNr. | Umsatzsteuer-Identifikationsnummer |
| USTA | US Telephone Association |
| UStG | Umsatzsteuergesetz |
| USV | Unterbrechungsfreie Stromversorgung, UPS |
| USV | UmSchaltVentil |
| usw | und so weiter |
| USW | Ultra Short Wave |
| UT | Universal Terminal/Time |
| UT | Unterer Totpunkt |
| UTA | Urban Traffic Assistent |
| UTC | Unicode Technical Committee |
| UTC | Universal Time Coordinated |
| UTF | Unicode Transformation Format (UTF-8, UTF-16, UTF-32) |
| UTF | Universal character set Transformation Format |
| UTI | Universal Text Interchange |
| UTL | User Trailer Label |
| UTLB | Unified TLB |
| UTMA | Ultra Thin Client Multiple Access |
| UTNET | University of Texas Network |
| UTP | Unshielded Twisted Pair |
| UTP | Universal Personal Telephone Service |
| UTRAN | UMTS Radio Access Network |
| UUCP | UNIX to UNIX Copy Program/Protokoll |
| uue | UU-codierte Datei (nur ASCII) |
| UUID | Unique Universal Identifier (DCE) |