K–12 refers to primary and secondary education in the United States, Canada, and Australia. K12 may also refer to: Arts and entertainment K–12 (album), by Melanie Martinez K–12 (film), the accompanying film Sonata in A, K. 12, by Wolfgang Amadeus Mozart A fictional ski slope in the film Better Off Dead Science and mathematics E. coli K-12, a bacterial strain Keratin 12, a protein Coxeter–Todd lattice K12, a 12-dimensional lattice Technology 21 cm K 12 (E) German World War II railway gun AMD K12, a CPU microarchitecture Curtiss K-12, an aircraft engine S&T Motiv K12, a South Korean machine gun K-12, an obsolete process for Kodachrome photographic film Vehicles Aircraft Kalinin K-12, a Soviet proof-of-concept aircraft Kawanishi K-12 Sakura, an experimental Japanese aircraft Automobiles Kandi K12, a Chinese microcar Nissan Micra (K12), a Japanese subcompact car Ships , a corvette of the Royal Navy , a submarine of the Royal Navy , a submarine of the Royal Netherlands Navy , a corvette of the Swedish Navy Other uses K-12 (Kansas highway), a former highway in Kansas K12 (mountain) K12 Inc., now Stride, Inc., an American education company