Shashka

A Caucasian/Circassian shashka

The shashka or shasqua (Adyghe: сэшхуэ, [saʃxʷa]long-knife; Russian: шашка) is a kind of North Caucasian sabre; a single-edged, single-handed, and guardless backsword. The comparatively subtle curve of a shashka blade puts the weapon midway between a typically curved sabre and a straight sword, effective for both cutting and thrusting.