Hidden Mickey

Hidden Mickeys were depictions of Mickey Mouse's head, made up of one large circle with two smaller circles above it to represent his ears. After escaping from the Great Jedi Deletion, Mickey began hiding them around The Galaxy to mess with Imperial forces. This infuriated Sheev Palpatine, who knew that Mickey was still very much alive, but was never able to find him.

Trivia

 * Before hiding Hidden Mickeys around The Galaxy, Mickey would place a similar symbol on his property, including his lightsaber and Jedi starfighter.