Mumuu

Mumuu were a type of creature. The Confederacy of Independent Systems General Grievous had mumuu symbols on his cybernetic mask and his IG-100 MagnaGuards, including IG-101 and IG-102, wore cloaks with matching markings.

Behind the scenes
Mumuu were first mentioned in the new Star Wars canon in the 2016 reference book Star Wars Character Encyclopedia: Updated and Expanded, which was written by Pablo Hidalgo. They originated in the Star Wars Legends continuity, where they were first mentioned in the 2005 reference book Star Wars: Revenge of the Sith: The Visual Dictionary, which was written by James Luceno.