Also known as: 苦无, 苦無, くない, 苦无手里剑
A kunai, also known as kunai-(shaped)-Shuriken (苦無手裏剣) is a Japanese weapon possibly derived from the masonry trowel. It's a multi-functional weapon that can be used for slashing, stabbing, throwing, and other various uses. It is commonly associated with the Ninja.