What does URN stand for?

MLA style: "URN." Acronym Finder . 2013. AcronymFinder.com 23 May. 2013 http://www.acronymfinder.com/User-Requirements-Notation-(URN).html
Chicago style: Acronym Finder . S.v. "URN." Retrieved May 23 2013 from http://www.acronymfinder.com/User-Requirements-Notation-(URN).html
APA style: URN. (n.d.) Acronym Finder. (2013). Retrieved May 23 2013 from http://www.acronymfinder.com/User-Requirements-Notation-(URN).html

User Requirements Notation

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User Requested Minor Use Label Expansion (Canada) User Requested Minor Use Registration (Canada) Uniform Regional Spring Wheat Nursery Uniform Resource Name Unique Reference Number Unit Reference Number Universal Resource Name Université de Rouyn-Noranda (French; Québec, Canada) University Radio Nottingham (UK) Unternehmensgesellschaft Verkehrsverbund Rhein-Neckar GmbH (German)		United Rentals North America, Inc. Utvar Rychleho Nasazeni (Czech republic police squad) universally recognized as nondiabetic University of Richmond National Debate Institute (Richmond, VA) Unidad Revolucionaria Nacional Guatemalteca (Spanish: National Guatemalan Revolutionary Unit) Uniform Random Number Generator (computing) Upper Republican Natural Resources District (Nebraska) University Royal Naval Unit Rouen, France - Rouen /Boos Airport (Airport Code) Ulises Ruiz Ortiz (Mexican governor)