Other
- NN, for Latin Nomen nescio or, equivalently, No Name, a person whose name is unknown
- Nynorsk, a Norwegian written language (ISO 639 alpha-1, nn)
- N.N., a pseudonym of 18th century Italian priest Camillo Almici
- Double net lease, a type of lease used for commercial real estate
- Night night, a text farewell at the end of an evening of online gaming
- No need, an Internet trading term
- On Wikipedia, WP:NN, "not notable"
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