JN

The abbreviation JN stands for:

Jan Mayen, country code of the island after the " FIPS PUB 10-4 territory code"
Johnson - Nyquist noise, caused by thermal motion of the charge carriers in electric circuits noise
Young National Democrats, the youth organization of the extreme right party NPD
Jurassic Neuchâtelois, a former railway company in Switzerland
Jurisdiction Act, Austrian law governing the exercise of jurisdiction and the jurisdiction of the ordinary courts in civil law matters.

JN as distinguishing signs on license plate:

Norway: Gjøvik in the province of Oppland
Czech Republic: for Okres Jablonec nad Nisou, German: Jablonec nad Nisou ( discontinued)

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