What does U stand for?

MLA style: "U." Acronym Finder . 2013. AcronymFinder.com 25 May. 2013 http://www.acronymfinder.com/Uncleared-(U).html
Chicago style: Acronym Finder . S.v. "U." Retrieved May 25 2013 from http://www.acronymfinder.com/Uncleared-(U).html
APA style: U. (n.d.) Acronym Finder. (2013). Retrieved May 25 2013 from http://www.acronymfinder.com/Uncleared-(U).html

Uncleared

This definition appears very rarely and is found in the following Acronym Finder categories:

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Atomic Unit (measure of mass) Envelope or Letter Sheet (Scott Catalogue prefix; philately) Kosher (from Union of Orthodox Hebrew Congregations) Sunday (one letter abbreviation for day of week) Ultra Umbrella Umdrehungen (German: RPM) Umpire Unclassified Uncle		Und (German: And) Underlined Unified Uniform (aviation letter code) Union Metallic Cartridge Co (division of Remington Arms; used on head stamp of .22 cartridges) Unit Unit of measurement for rackmount equipment (U is 1.75in or 4.44cm) Unitary (mathematics) United Universal