Raijin is the god of lightning, thunder and storms in Japanese mythology and is a common motif in Japanese art and tattoo culture. His name is derived from the Japanese words rai, meaning thunder and shin, meaning god. He is typically depicted as a demon looking spirit, beating drums to create thunder, usually with the tomoe symbol drawn on the drums.

Typically, Raijin is paired with Fujin, the god of wind, as in this sleeve below