A kunai throwing  knife is a Japanese knife. The word "kunai" is composed of two kanji, one meaning "dagger" and the other meaning "spoon". Kunai are typically sources of intimidation, utilized in Japanese martial arts as an improvised weapon. With proper training they are also capable of breaking bone or severing organs with considerable force and precision.  Tessen and Shuriken: They have since become popular weapons for ninja practitioners worldwide, and now come in a wide range of shapes and sizes. Kunai knives are used by ninjas armed with either tessen - the traditional jitte-like pole weapon, or shuriken - the seta (throwing star) often called "throwing knives". In the kunai throwing community, a tessen is used for combat and a shuriken is used for competition. A kunai or shuriken thrown properly will cause devastating damage to the human body, often being described as being able to cut through flesh and bone with ease.  A tessen ...