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U
unicode
unified messaging
Uniform Resource Locator [URL]
uninterruptible power supply [UPS]
unit test
United Nations Commission on International Trade Law [UNCITRAL]
universal address
universal serial bus [USB]
unshielded twisted pair [UTP]
upsizing
URL address [Internet]
usability test
user acceptance
user acceptance rehearsal
user acceptance test
user authentication
user requirement
user-friendly system
utility software