What is Furisodegata in Japanese Katana terminology?

The term "Furisodegata" (振袖形, ふりそでがた) refers to a specific shape of the tang (Nakago) of a Japanese sword. In this style, there is no difference in width between the base and the tip of the tang, and a curve extends from the blade to the ridge in the middle of the tang. This shape is reminiscent of a Furisode, a style of kimono with long, swinging sleeves, which is why it is called "Furisodegata". This style is often seen in short swords (Tanto) from the Kamakura period and in the "Metezashi", a type of waist sword that became popular towards the end of the Kamakura period.