What does NN stand for?

MLA style: "NN." Acronym Finder . 2012. AcronymFinder.com 1 Jun. 2012 <a href="http://www.acronymfinder.com/Northampton-(postcode%2c-United-Kingdom)-(NN).html">http://www.acronymfinder.com/Northampton-(postcode%2c-United-Kingdom)-(NN).html
Chicago style: Acronym Finder . S.v. "NN." Retrieved June 1 2012 from <a href="http://www.acronymfinder.com/Northampton-(postcode%2c-United-Kingdom)-(NN).html">http://www.acronymfinder.com/Northampton-(postcode%2c-United-Kingdom)-(NN).html
APA style: NN. (n.d.) Acronym Finder. (2012). Retrieved June 1 2012 from <a href="http://www.acronymfinder.com/Northampton-(postcode%2c-United-Kingdom)-(NN).html">http://www.acronymfinder.com/Northampton-(postcode%2c-United-Kingdom)-(NN).html

Northampton (postcode, United Kingdom)

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

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No Noobs (gaming) Nomen Nescio (Latin: I Don't Know the Name) Nomen Nominandum (Latin: Name Hitherto Unknown) Non Nominatus/Nominata (Latin: Not Named, epigraphy) Non-Nude Non-Participating National (FCC) Nonnuclear Noon Normal to Normal Normalnull (German: Sea Level)		Not Necessary Not Negotiable Not Nominated Not Notable (Wikimedia Foundation editing policy) Not Now Nouvelles Normes (classification hôtelière; France) Nearest-Neighbor Tight Binding Nielsen Norman Group (also seen as NNG; Fremont, CA) National Network of Libraries of Medicine Nothing Nice to Say (online comic)