Qin jian is a type of Chinese sword that was developed during the Qin Dynasty (221-206 BC). It is also known as a hook sword or hu jiao dao, and is characterized by a curved, hook-like blade that is used for hooking and trapping an opponent's weapon.
The qin jian is a single-edged sword with a long, curved blade that is sharpened on the inner edge. It has a straight handle, or tang, that extends through the grip and is used for thrusting and cutting. The tang is typically made of wood or bone and is covered with a decorative material, such as cord or leather.
Qin jian swords were traditionally used by the Chinese military and were considered to be a symbol of rank and authority. They were also used in martial arts training and were popular among scholars and intellectuals. Today, qin jian swords are used in various forms of Chinese martial arts, such as wushu and tai chi, as well as in ceremonial and decorative contexts.