NN

NN, Nn, or nn may refer to:

NN/nn, Nynorsk, a Norwegian written language (ISO 639 alpha-1 code "nn"). They are sometimes used on websites to distinguish them from their counterparts Bokmål. E.g. nn.wikipedia.org vs no.wikipedia.org.

Businesses and organizations

 * Nationale-Nederlanden, a Dutch insurance company commonly referred to as NN
 * Netroots Nation, a political convention for American progressive activists
 * Nevada Northern Railway (reporting mark NN)
 * Norilsk Nickel, а metallurgical and mining company
 * VIM Airlines (IATA airline designator NN)
 * Nigerian Navy, A part of the armed forces of Nigeria

Places

 * NN postcode area, UK, for areas of Northamptonshire, England
 * Nizhniy Novgorod, a Russian city/major trading center
 * Newport News, a city in Virginia, United States

Science and technology

 * Nearest neighbor (disambiguation), with several related uses in mathematics
 * Net neutrality, the principle that Internet service providers should treat all data the same
 * Neural network, a group of interconnected nerve cells or a machine-learning model inspired by one
 * Normalnull, a German height reference system preceding Normalhöhennull (NHN)
 * nn, the chemical symbol for the hypothetical element Neutronium

Other uses

 * N. N., a pseudonym of 18th-century Italian priest Camillo Almici
 * N. N., pseudonym of Russian economist Sergei Prokopovich
 * NN (film), a 2014 Peruvian film
 * $⟨nn⟩$ is a digraph, see
 * Ñ, a letter in Spanish, originally derived from the written "nn"
 * Double net lease, a type of lease used for commercial real estate
 * Nomen nescio (Latin for "no name"), a person whose name is unknown
 * NN, the production code for the 1967 Doctor Who serial The Abominable Snowmen
 * Nick Nurse, head coach of the NBA's Toronto Raptors
 * Nintendo Network, a discontinued Nintendo service