British Coupling is not a specific brand or model of coupling, but refers to the threaded quick couplings used in British standard fire hydrants, fire hoses and fire truck pump systems.
Fire hose coupling is the metal fitting attached to the end of a fire hose, allowing multiple hoses to be connected together (to extend length) or to be connected to other equipment like hydrants, fire pumps, nozzles, and monitors.
Russian GOST Couplings are a type of fire hose couplings that conform to the Russian national standards. They are often used in industrial and firefighting applications in Russia.