Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym U is...

U is

United
Ultimate
Undefeated
Unofficial

More Meanings For U:

Uranium
Undetectable
designation for an integrated circuit
Micro-
Micro-
Upsilon
Uncertain
Uninterpretable
Micro-
Unexcelled
Unsatisfactory
Undergraduate
University
Undecided
Unlimited

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