NN

NN, Nn, or nn may refer to:

NN/nn, Nynorsk, a Norwegian written language (ISO 639 alpha-1 code "nn"). Sometimes used on websites to distinguish it from its counterpart 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

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 computing network inspired by biological neural networks
• 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 List of Latin-script digraphs § N
• 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