Katanas are class ofweapons that specialize in cutting damage. They are the most common weapon type in Kenshi.
Weapon Skill - Katana
The Katana skill determines damage with weapons classified as Katanas. The skill is defined in game as
"Affects damage. Katanas are a common weapon, and their quality varies greatly. Most are scavenged goods with a history of owners and barely good for scrap. Masterworks are around however, and their speed and cutting power is un-rivalled by any other blade."