What does UPN stand for?

MLA style: "UPN." Acronym Finder . 2012. AcronymFinder.com 4 Jun. 2012 <a href="http://www.acronymfinder.com/Umgekehrte-Polnische-Notation-(German%3a-Reversed-Polish-Notation)-(UPN).html">http://www.acronymfinder.com/Umgekehrte-Polnische-Notation-(German%3a-Reversed-Polish-Notation)-(UPN).html
Chicago style: Acronym Finder . S.v. "UPN." Retrieved June 4 2012 from <a href="http://www.acronymfinder.com/Umgekehrte-Polnische-Notation-(German%3a-Reversed-Polish-Notation)-(UPN).html">http://www.acronymfinder.com/Umgekehrte-Polnische-Notation-(German%3a-Reversed-Polish-Notation)-(UPN).html
APA style: UPN. (n.d.) Acronym Finder. (2012). Retrieved June 4 2012 from <a href="http://www.acronymfinder.com/Umgekehrte-Polnische-Notation-(German%3a-Reversed-Polish-Notation)-(UPN).html">http://www.acronymfinder.com/Umgekehrte-Polnische-Notation-(German%3a-Reversed-Polish-Notation)-(UPN).html

Umgekehrte Polnische Notation (German: Reversed Polish Notation)

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