What is Komaru Boshi in Japanese Katana terminology?
The term "小丸帽子" (Komaru Boshi) refers to a type of tempering pattern on a Japanese sword where the tempered edge part is normal, and from the Yokote line towards the tip, the tip returns drawing a small arc. On the other hand, the term "小孔帽子" refers to a type of tempering pattern where the tempered edge part is deep, the return is close to the small ridge, and the return angle is small. These tempering patterns are not just for aesthetics, but they also reinforce the important tip of the sword. The creation of these return patterns is a difficult task that reveals the skill of the swordsmith.