【Tri edge】
−三叉刃−

切り裂く刃に縁取られ、
突き刺す刃が濡れ光る。
光すべらす神魔の宝具。
鍛冶の匠の、極。

3 had a special meaning from ancient times, such as a pyramid, a tower, and a mural painting. 
It served both as the bow and the sword and drew in the arms image with three edges.