One school calls it the hidden sword technique, and the school practices attacking stealthily, attacking mainly the vital parts of the body such as the neck, throat, chest, the pit of the stomach, and the backbone (spinal cord).
ある流派では穏剣術と称し、その流派では背後からの攻撃などの不意打ちが多く、狙う所は首、喉元、胸、みぞおち、背骨(脊髄)など人体急所が多い。