Rokushiki, also known as Six Powers, are super-human abilities that select people in the One Piece world can utilize after going through a specific, rigorous training regime. This power was first introduced to the fans through the Galley-La shipwrights, who later turned out to be members of the World Government intelligence agency, Cipher Pol Number 9.
Source：https://www.cbr.com/one-piece-known-rokushiki-abilities-ranked/
