What is Osoraku-zukuri in Japanese Katana terminology?

"""Osoraku-zukuri"" (おそらくづくり) refers to a specific style of construction for a short sword or ""tantō"". In this style, the Yokote line (the line separating the body of the blade from the point) is positioned around the middle of the blade, and more than half of the blade is made up of the cutting point, resulting in a deeply curved construction. This style is notably seen in a short sword made by Shimada Sukemune, which was owned by the famous daimyo Takeda Shingen. The name ""Osoraku-zukuri"" is said to have been derived from the inscription of the word ""Osoraku"" on the blade of this sword.

This style of construction is not only unique in its appearance but also in its functionality. The deep curve and extended cutting point enhance the sword's cutting ability, making it a highly effective weapon. The inscription on the blade adds to the historical and cultural significance of the sword, making it a valuable artifact in the study of Japanese swords."