What does PN stand for?

MLA style: "PN." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 <a href="http://www.acronymfinder.com/US-Postal-Note-(Scott-Catalogue-prefix%3b-philately)-(PN).html">http://www.acronymfinder.com/US-Postal-Note-(Scott-Catalogue-prefix%3b-philately)-(PN).html
Chicago style: Acronym Finder . S.v. "PN." Retrieved June 2 2012 from <a href="http://www.acronymfinder.com/US-Postal-Note-(Scott-Catalogue-prefix%3b-philately)-(PN).html">http://www.acronymfinder.com/US-Postal-Note-(Scott-Catalogue-prefix%3b-philately)-(PN).html
APA style: PN. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from <a href="http://www.acronymfinder.com/US-Postal-Note-(Scott-Catalogue-prefix%3b-philately)-(PN).html">http://www.acronymfinder.com/US-Postal-Note-(Scott-Catalogue-prefix%3b-philately)-(PN).html

US Postal Note (Scott Catalogue prefix; philately)

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