K3 or K-3 can mean: · K3 , a Belgian girl group. · YP-K3, a brand of MP3 Player by Samsung · K3 , a Catalan television channel. · K3 surface, in mathematics. · K3 Media, Web site design and development agency. · Daewoo K3 Light Machine Gun, in service with the South Korean Army. · Soviet submarine K-3 Leninsky Komsomol, the first Soviet nuclear submarine. · K-3 , a state highway in Kansas. · K3, the 5th world in the Super Nintendo game Donkey Kong Country 3. · Broad Peak, a mountain. · Kawai K3, a hybrid digital/analog keyboard synthesizer manufactured in the mid-1980s. · K3, nickname/abbreviation of the city of Kankakee, IL. Located in Kankakee County. · K3 - High-performance amateur radio transceiver made by Elecraft K3K3K3K3