It says Katana as Samurai sword was made the northern area of Japan at first by specialist of sword blacksmith.

The individual sword curve was invention to use while riding a horse when it was made at the first time.
Samurai swords is famous of it sharpness but how much does it has?
There are many famous swords with its story.
–          “Kamewari” cut robber and a large ceramic into two exact halves where a robber was hidden.
–          “Shokudaigiri Mitsutada” when a general cut a criminal, overenthusiastically cut down the criminal and his metal candle stand.
–          “Heshigiri Hasebe” cut both of them a criminal who escaped to behind of a shelf and shelf at onece.

etc., etc.