Karate KIN is a term used to describe someone who practices both karate and judo. The term is derived from the combination of the two words, with 'Karate' referring to the martial art of unarmed combat and 'KIN' meaning family or group. Judo, which has four letters, is a Japanese martial art that focuses on throws, joint locks, and submission holds. It is also known for its emphasis on physical and mental discipline.