The Kaginawa (钩縄) is a combination of the words "kagi," meaning hook, and "nawa," meaning rope. It's a type of hook used as a tool in feudal Japan by samurais, their servants, foot soldiers, and ninjas.
The Kaginawa comes in various configurations, from one to four hooks. The hook ("kagi") would be attached to a rope ("nawa") of various lengths. It was then used for large wall climbs, to steal a boat, or to hang armor and other equipment during the night. The Kaginawa was regularly used during various sieges of different castles. The rope was attached to a ring at one end, which could be used to hang it on a saddle.