According to the shape, all kinds of Japanese knives are placed in different directions because of the different directions of inscription. Tachi: Generally, it is longer than a knife, and the radian of the blade is also higher. There is no hard and fast way to wear a knife. However, in order to facilitate the cavalry to cut down the enemy on the ground, Taidao is usually worn with the edge down and hung under the belt. Japanese Dao is divided into front and back, and the front of Taidao is the right side. The location of the inscription is the key. If you point up first, take the blade as the front of the sword, and the inscription of Taidao is on the right side of the blade. Hairy Taidao: Tsuka with the function of stem exists in the transition period from straight knife to curved knife. Small black pill-shaped Taidao: From the pickaxe to the object, the front is double-edged. Slight bending is a kind of knife in the transition period from straight knife to curved knife. The striking knife (ぅちかたな, with a knife inside) is generally shorter than the Taidao, and the curvature of the blade body is also lower. In order to achieve the fastest drawing speed, it is traditionally worn with the blade facing upwards and the scabbard inserted in the belt. If you point up first, take the blade as the front of the sword, and the inscription is on the left side of the blade. So the front of the knife is the left. According to modern classification, it refers to knives with a knife length of more than 60cm (knife length: first refers to the linear distance to the building area). Wakizashi: also known as threatening finger, refers to a knife with a length of more than 30cm and a width of 60cm. Tantou: A 30 cm long knife. In addition, the knife made by flat method is more than 30cm in length, but there is no knife reverse, so it is often classified as short knife. Besides, according to The Times, it is on the first floor.