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JN may refer to:
- Jan Mayen (FIPS PUB 10-4 territory code), an island in the Arctic Ocean
- Johnson–Nyquist noise, electrical noise generated by random thermal motion in a conductor
- Jornal de Notícias, a Portuguese newspaper
- Jornal Nacional, a Brazilian news program
- Excel Airways (IATA airline designator)
Jn or Jn. may refer to:
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