The Soul Solid (魂の喪剣（ソウルソリッド）, Souru Soriddo) is the cane sword of Brook, the musician of the Straw Hat Pirates. It's also referred to as the "Freezing Sword". The sword appears in manga series One Piece that was created by Eiichiro Oda. The series first began serialization in Weekly Shōnen Jump on August 4, 1997. This cane sword didn't appear until the Thriller Bark Arc, that began in Volume 46. It first appeared in One Piece Volume 3 CH. 442 "Adventure in Demonic Sea", and
The sword was never officially named until after the time skip era in One Piece Vol. 65. It's unknown if the sword has always held this name.
Thriller Bark Arc
Fish-Man Island Arc
The first anime appearance was in One Piece - Episode 337 "Venture Into the Devil's Sea! The Mysterious Skeleton Floating Through the Fog".