The hi groove is a part of the chiseling in the Japanese sword
And its original purpose is to make the sword lighter and more resistant to bending. As time went on, decorative factors as well as practical ones were added to the sword-making.
The width and depth of the hi groove reflected its school. For example, many of the wide hi grooves were from the Miike school of Chikugo (Fukuoka) and the Mitsutada school of Bizen (Okayama), whereas the narrow ones are seen largely in the Soshu (Kanagawa) swords. The shallow groove (also called sara-hi or “plate Hi groove”) are seen in the Raikunitsugu swords from Yamashiro (Kyoto), but is also found in the Miike swords and is considered typical of swords made by Tenta Miike. Here I will explain the different types of hi groove.
Bo-hi (bar hi groove)
The bo-hi is the most common form of hi (Hi groove) and when someone simply says “hi” it often means “bo-hi”. The shinogichi (ridge line) is carved in a straight line, but there are actually two types: one where the ridge line is still left on the ridge area, and another where the ridge lines are left on both sides of the blade. There is also a style where two lines are carved alongside each other on the ridge line. This is called nisuji-hi and is seen mainly in the Kamakura era, especially in the work of Teiso of Sagami (Kanagawa). There is also a style with three carved lines, though very rare.
Soe-hi (accompanying hi groove)
Sometimes, along the bouhi, there is a line that is not the same size but thinner. This is called soehi. Soetimes the soehi extends to the ridge area and moves over the top of the bouhi. This is called renhi and is found largely among the Bizen (Okayama) swords.
Shobu-hi (iris hi groove)
The top of the Futasuji-hi(double grooves) joint, making it look like the shape of an iris. This is seen in swords by Kunimitsu and Norikuni of the Raiha school, and mainly in the Miike school from Chikugo (Fukuoka) or Akihiro from Sagami (Kanagawa). Sometimes one of the iris Hi grooves is cut off half way, and this is called “kuichigai-hi” (divergent Hi groove).
Koshi-hi (waist hi groove)
In this type the bo-hi is carved shortly to the waist area. After the bo-hi, it has the longest history as a type of Hi groove. The koshi-hi is said to represent the Ragaraja, the god of love (Aizen-myo’o).
As its name suggests, it is seen a lot in nagainata, but also in blades made in the “unokubi” (cormorant neck) style.
Kakinagashi-hi (extended carve hi groove)
The hi extends to the tang of the sword instead of stopping at the baseboard. The hi stops halfway at the tang. If the hi extends toward the end of the tang, it is called “kakitoshi-hi” (carved-through Hi groove).
Tome-hi (stopped hi groove)
If the shape of tome-hi is square, it is called kaku-tome and if it is round it is called maru-tome. The square one is seen in the old Bizen (Okayama) swords by Tomonari and the Bizen swords in the mid Kamakura era. In most eras it is seen in the older swords. The round ones are seen in the post-mid Kamakura era swords from Bizen, and throughout the Muromachi era. In the new era swords, the round clasps are seen predominantly.
The hi is not simply a gutter carved into the blade, but reveals the characteristics of the era and schools of sword.
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