Additionally, while the gesture of cutting the air 4 times vertically and 5 times horizontally appear in some scriptures such as Taoist Scriptures and has existed from long ago, a gesture of ketsuin is not described in those old scriptures.
なお、四縦五横に切る所作自体は道教経典等にも見え古くから存在しているが、結印の所作は見えない。