The word Mimir has several meanings.

• Mímir is a primal god of Norse mythology
• Mimir was also the name of the Sigurd's foster father in the Thidrekssaga, who in other sources is called Regin. He is the source for the figure of Mime in Wagner's Ring cycle.
• A mimir is also a magical construct that is created to provide information to players in the Planescape setting for the Dungeons & Dragons role-playing game. They are usually a silvery, metallic, disembodied skull (the name and concept is derived from the first definition above).
• Mimir is also a textural music project of the members of The Legendary Pink Dots and Christoph Heemann.

Dungeons & Dragons magical items