小鎬筋 Koshinogi-suji / Small Ridge Line

What is Koshinogi-suji in Japanese Katana terminology?

The term "Koshinogi-suji" refers to the ridge line that appears above the Yokote-suji. The "Shinogi-suji" is a line that runs in the center between the blade and the back (Mune), rises in a mountain shape, and continues from the Munemachi to the Kissaki (point). The Koshinogi-suji is an important point in appreciating the beauty of a Japanese sword.