Long sword forged using a method developed uniquely in Japan.

From time immemorial, the katana has been more than just a weapon and has held a symbolic significance as the "soul of the samurai".

The Cyborg Ninja and Raiden are armed with these swords.

Also, Solidus Snake had two katana, named "Kyouwa (Republican)" and "Minshu (Democrat)", and was a master of two-sword fighting.