Chokutō

The chokutō (直刀, 'straight sword') is a straight, single-edged Japanese sword that was mainly produced prior to the 9th century. Its basic style is likely derived from similar swords of ancient China. Chokutō were used on foot for stabbing or slashing and were worn hung from the waist. Until the Heian period such swords were called tachi (大刀), distinct from tachi written as 太刀, as the latter refers to curved swords.