The P40 was an Italian World War II tank design. It was armed with a 75 mm gun and an 8 mm Breda machine gun, plus another optional machine gun in an anti-aircraft mount. The official Italian designation was Carro Armato ("armored tank") P 26/40. The designation means:[citation needed] P for pesante (Italian: "heavy"), the weight of 26 tons, and the year of adoption 1940. Design had started in 1940 but very few had been built by the time Italy signed the armistice with the Allies in September 1943 and the few produced afterwards were used by the Germans.