What is Soebi in Japanese Katana terminology?

The term "Soebi" (添樋, そえび) refers to a specific type of groove (Hi) carved into a Japanese sword. This groove is carved parallel to a larger groove known as "Bohi" (棒樋), which runs along the length of the blade. The Soebi is a type of blade carving (Horimono) that enhances the aesthetic appeal of the sword. If the Soebi extends all the way to the tip of the Bohi, it is specifically referred to as "Tsurehi" (連樋, つれひ). This terminology is used to describe the specific characteristics of the sword's structure, contributing to its overall aesthetic and functional design.