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Abkürzung-Kategorie: u
| Abkürzung | Langform |
| u | und |
| U | Ultra-, Uniform, Universal, Unix, User |
| u.c. | usual conditions (übliche Bedingungen) |
| u.t. | usual terms (übliche Bedingungen) |
| u.v.a. | und viele andere |
| U/w | underwriter (Versicherer) |
| UA | Unnumbered Acknowledgement (frame) |
| UA | User Area/Agent (OSI) |
| UA | Upgrade Advantage |
| UA | Ukraine |
| UA | Unterausschuss |
| UAA | Universally Administered Address |
| UAC | Unbalanced Asynchronous Class |
| UAE | Universelle Anschlusseinrichtung |
| UAE | Unrecoverable Application Error |
| UAE | Vereinigte Arabische Emirate |
| UAF | User Authorization File |
| UAG | Umweltaudit-Gesetz (pdf-Datei) |
| UAGBV | UAG-Beleihungsverordnung |
| UAGGebV | UAG-Gebührenverordnung |
| UAGZV | UAG-Zulassungsverordnung |
| UAM | User Authentication Method/Module |
| UART | Universal Asynchronous Receiver Transmitter |
| UAWG | Universal ADSL Working Group |
| UBA | Umweltbundesamt |
| UBC | University of British Columbia |
| UBC | Unified Buffer Cache |
| UBE | Unsolicited Bulk Electronic Mail |
| UBR | Unspecified/Undefined Bit Rate |
| UC | Upper Case |
| UC | Ubiquitous Computing |
| UC | Universal Code |
| uc2 | Ultra Compressor Datei |
| UCAID | University Corporation for Advanced Internet Development |
| UCAR | University Corporation for Atmospheric Research |
| UCB | University of California at Berkeley, USA |
| UCC | Unified Chassis Control |
| UCD | Uniform Call Distributor |
| UCE | Unsolicited Commercial Electronic Mail |
| UCF | Unregister Confirmation |
| UCFS | Unix Connectivity File Service |
| UCITA | Uniform Computer Information Transaction Act |
| UCL | Understeering Control Logic |
| UCL | Universal Communications Language |
| UCL | University College London |
| UCLA | University of California at Los Angeles, USA |
| UCLAF | Unité de coordination de la lutte anti-fraude - Stelle zur Koordinierung der Maßnahmen zur Betrugsbekämpfung |
| UCO | Unstructured Complex Object |
| UCR | Undercolor Removal |
| UCS | Universal Card Slot |