J4
J4 or J-4 stands for:
- Buffalo Airways , a Canadian airline based on the IATA airline code
- Food key for meat substitute products, see federal food key # Food main and subgroups (positions 1 + 2)
- HMS J4 , a British Royal Navy submarine during World War I.
- J4 Supercharged, a car model by the British manufacturer MG, see MG J-Type # J4 Supercharged (1933)
- Junkers J4, the factory name for a two-seater ground attack aircraft used by the German air force in the First World War, see Junkers JI
- J-4 is the Chinese name of the MiG-17 delivered to China, see Mikojan-Gurewitsch MiG-17 # China
- Wright J-4 , an aircraft engine
- the Johnson body J 4 , the square dome
- the Janko group J 4
