What is Kissaki Morohazukuri in Japanese Katana terminology?

The term "Kissaki Morohazukuri" (切先両刃造, きっさきもろはづくり) refers to a specific style of Japanese sword construction where only the tip (Kissaki) is double-edged. This style was created during the transitional period from straight swords (Chokuto) to curved swords (Wanto). It is believed that this design was intended to serve both stabbing and cutting purposes. This style can be seen in the "Kogarasumaru" of the Taira clan, and hence it is also referred to as "Kogarasumaru-zukuri". This terminology is used to describe the specific characteristics of the sword's structure, contributing to its overall aesthetic and functional design.