Sekolah Kebangsaan, see types of school in Malaysia

"End of communication" (Morse code prosign)

Sk is the local acronym for Slovak crown

Schroet Kommando (a well known Multinational Computer Gaming Organization)

Shonen Knife - a Japanese rock trio

SK channel, a small conductance calcium-activated potassium channel

SK, a people mover; SK stands for its initiators, Soulé and Kermadec.

Suomen Kuvalehti - a Finnish magazine

Silent key - an amateur radio operator who has died

Saskatchewan (Canadian Province/Territory Code)

Slovakia (ISO country code)

Slater-Koster (J.C. Slater and G.F. Koster), see Tight Binding - Orbitals

Slovak language (ISO 639)

.sk is the Internet country code top-level domain (ccTLD) for Slovakia

ISO 3166-2:SK are codes for the regions of Slovakia

Stockport postcode

Sangguniang Kabataan (the mainstream youth barangay Katipunan ng Kabataan organization in the Philippines)

SK Corporation of South Korea

the IATA code for Scandinavian Airlines System

Storekeeper, a Naval rating in the United States Navy

Suankularb Wittayalai School, Famous public boy Secondary school in Bangkok, Thailand

SK or S.K is short form of South Kanara district in Karnataka,India.