FSK

FSK can have alternative meanings:

Federal Counterintelligence Service, (Federalnaya Sluzhba Kontrrazvedki, Федера́льная Слу́жба Контрразве́дки), Federal Counterintelligence Service of Russia)
Frequency-shift keying, an electronic communications modulation scheme
Forsvarets Spesialkommando (FSK), a Norwegian special forces military unit
FSK (band), a German band
Freiwillige Selbstkontrolle der Filmwirtschaft, a German movie rating organization
Fsk, pen name for Boštjan Čadež, creator of Line Rider

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