| Subject | English | Danish |
| commun., IT | user datagram protocol | UDP |
| comp., MS | 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 | UDP (User Datagram Protocol) |
| commun., IT | user-to-user protocol | user til user-protokol |
| IT | user-user protocol | protokol |