User Datagram Protocol, a simple transport protocol used on the Internet, contrasted with TCP
User Data Preservation, a feature of mobile phones that retains user data after a firmware update
Usenet Death Penalty, a penalty against Usenet users or Internet service providers
Other
Unit Deployment Program, overseas rotations to Japan by United States Marine Corps squadrons and battalions
Unitary Development Plan, formerly a spatial planning plan used by local authorities in England and Wales
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