What is Nakagojiri in Japanese Katana terminology?

The term "Nakagojiri" (茎尻, なかごじり) refers to the bottom end of the tang (Nakago) of a Japanese sword. The shape of the Nakagojiri varies depending on the era in which the sword was made and the school of the swordsmith. Based on the shape, it is classified into various types such as "Ichimonji", "Kurijiri", "Haagari Kurijiri", "Ken-gata", and "Iriyama-gata". This part of the sword is where the individuality of the swordsmith is often most clearly expressed.

Types of Nakagojiri: