| Subject | German | English |
| telecom. | Breitband User-Network Interface | Broadband User/Network Interface (RACE-project, RACE-Projekt) |
| interntl.trade., engl. | Customs User Fees | Customs User Fees |
| commun., IT | Directory User Agent | directory user agent |
| comp., MS | global routbarer Benutzer-Agent-URI, Globally Routable User Agent URI | globally routable user agent URI (A URI that a SIP program can use to route a call to a specific agent) |
| abbr. | graphical user interface | GUI |
| phys. | Multi-User-System | multi-user system |
| IT | Multi-User und Multifunktionsschnittsstelle | multifunction multi-user interface |
| commun. | Telephone User Part | telephone user part |
| IT | user agent | User agent |
| commun., IT | User Datagram Protocol | user datagram protocol |
| commun., IT | User-Datagram-Protocol | user datagram protocol |
| comp., MS | User Datagram-Protokoll | User Datagram Protocol (A connectionless transport protocol in the TCP/IP protocol stack that is used in cases where some packet loss is acceptable, for example, with digital media streams) |
| IT | user-relative-Kennzeichnung | user-relative-identifier |
| comp., MS | User Story | user story (A high-level description of a user goal that helps you estimate the work needed to achieve this goal. User stories are the fundamental element of planning agile projects) |
| mater.sc., mech.eng. | User-Szene | scene |
| commun. | "User-to-User"-Zeichengabe | user-to-user signalling |