Black belt (martial arts) of ability when using these tactics and are sometimes referred to as McDojos or belt factories. In some Japanese schools, after obtaining a black belt the student also begins to instruct, and may be referred to as a senpai (senior student) or sensei (teacher). In others, a black belt student should not be called sensei until they are sandan (third degree black belt), or the titles kyosa or sabom in Korean martial arts as second degree or higher, as this denotes a greater degree of experience and a sensei must have this and grasp of what is involved in teaching
Obi (martial arts) Obi (martial arts) Many Japanese martial arts feature an obi as part of their exercise outfit. These obis are often made of thick cotton and are about 5 cm wide. The martial arts obis are most often worn in the "koma-musubi" knot (square knot); in practice where hakama is worn, the "obi" is tied in other ways. In many martial arts the colour of the obi signifies the wearer's skill level. Usually the colours start from the beginner's white and end in the master's black, or red and white master belt. Unlike in many other martial arts, adult practitioners of