SEK
SEK is an abbreviation for:
- Schwalm-Eder-Kreis , a district in the administrative district of Kassel in northern Hesse
- Swedish krona , as a currency code according to ISO 4217
- Federation of Swiss Protestant Churches , former name for the union of the Reformed regional churches (cantonal churches) and the Evangelical Methodist Church in Switzerland, today the Evangelical Reformed Church in Switzerland with its seat in Bern
- very serious climber , sport climbing #difficulty climbing
- SEK animation studio, North Korean studio
- Secondary level , age groups in school
- Sidirodromoi Ellinikou Kratous (Railways of the Greek State) , forerunner of the Organismos Sidirodromon Ellados (OSE)
- Special direct costs, direct costs that occur in irregular amounts and at irregular intervals (as opposed to fixed costs)
- Special task force , a special unit of the German police (colloquial, but incorrect, also "special task force")
- Specialized marine forces (SEK M), including combat swimmers and mine divers of the German Navy
- Spielentwicklungskombinat GmbH, also known as SEK-Ost , former German game developer, based in Berlin-Kreuzberg
SE-K is an abbreviation for:
- Blekinge län , province ( län ) in the south of Sweden, which includes the entire historical province of Blekinge according to ISO 3166-2
Sec. Is an abbreviation for:
- Second , in colloquial, unofficial German, the correct unit symbol for second is s
See also: