The term British Weapon of WWII can be summarized as the STEN, a four-letter acronym for the British submachine gun developed in 1940. The STEN was a lightweight and inexpensive weapon that was used by British and Commonwealth forces during World War II. It was designed to be mass-produced quickly and cheaply, and it was used by infantry soldiers and paratroopers. The STEN was reliable and easy to use, and it was widely used by Allied forces throughout the war.