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
Japanese martial arts ("menkyo kaiden"). In the modern system, first introduced in the martial arts through judo, students progress by promotion through a series of grades (kyū), followed by a series of degrees (dan), pursuant to formal testing procedures. Some arts use only white and black belts to distinguish between levels, while others use a progression of colored belts for kyū levels. It has often been said that forms ("kata") are the backbone of the martial arts. Nevertheless, different schools and styles put a varying amount of emphasis upon their practice. Hall, David A. "Encyclopedia of Japanese Martial Arts". Kodansha USA, 2012. Japanese