Sambo (; ) is a Russian martial art and combat sport. The word "SAMBO" is an acronym for SAMozashchita Bez Oruzhiya, which literally translates as "self-defense without weapons". Sambo is relatively modern since its development began in the early 1920s by the Soviet Red Army to improve their hand-to-hand combat abilities. It was intended to be a merger of the most effective techniques of other martial arts.