What is Mitsukado in Japanese Katana terminology?

The term "Mitsukado" (三ツ角, みつかど) refers to the point where the cutting edge, the curve of the tip (Fukura), and the Yokote-suji (the line separating the blade and the tip) intersect on a Japanese sword. From the Mitsukado towards the tip of the sword (Kissaki), the curve is different from the upper body (Kami) of the sword. This is a critical area that requires meticulous attention from the swordsmith or the Togishi, the craftsman responsible for polishing the sword. The shape and finish of this area significantly contribute to the overall aesthetic and functional design of the sword.