Kan' (Penetration) is a strong penetrating power that can pass through enemy's armor; 'Chu' (Precision) is a hit rate of 100 hits out of 100 shots; 'Kyu' (Persistence) means 'Kan' and 'Chu' can be persistently maintained.
「貫」は敵兵の鎧まで貫く強力な貫通力、「中」は百射百中の命中率、「久」は貫・中を永久に実践できることを意味する。