The name of Trafalgar Law's sword is "kikoku." Kikoku is a unique sword wielded by Trafalgar Law, a character from the manga and anime series "One Piece." It is a powerful and distinctive weapon with a curved blade and a unique hilt design.

Law's sword, Kikoku, holds significance in the series and is associated with his abilities as a pirate and a member of the Heart Pirates. It plays a pivotal role in his combat techniques and contributes to his distinct fighting style.