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 rule of thumb, the primary purpose of a "koryū" martial art was for use in war. The most extreme example of a "koryū" school is one that preserves its traditional, and often ancient, martial practices even in the absence of continuing wars in which to test them. Other "koryū" schools may have made modifications to their practices that reflect the passage of time (which may or may not have resulted in the loss of ""koryū"" status in the eyes of its peers). This is as opposed to "modern" martial arts, whose primary focus is generally upon the self-improvement (mental, physical,