Sasuke Uchiha's sword, the Kusanagi Sword, belongs to the category of a ninjato, also known as a ninja sword. The ninjato is a fictional type of sword commonly associated with ninja characters in anime, manga, and other forms of media.

The Kusanagi Sword is depicted with a straight, single-edged blade, a circular handguard, and a hilt wrapped in bandages. Its design resembles that of a traditional Japanese sword, such as a katana or a tachi, but with some distinct differences.

While the ninjato as a historical weapon is a subject of debate among historians, it has become an iconic weapon commonly associated with ninja characters in popular culture. In the Naruto series, the Kusanagi Sword is portrayed as a formidable weapon with exceptional cutting power and the ability to channel Sasuke's elemental techniques.

It is important to note that the portrayal of the Kusanagi Sword in the Naruto series is primarily a fictional concept created for entertainment purposes, and it does not directly correspond to any specific historical sword type.