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Celtic skull symbolic meaning deals with some very deep themes. Stuff like transience, power, spirit and portals of new understanding. There are a lot of reasons the skull was a pervasive and powerful symbol to the ancient Celts. The skulls is a bony structure in the head of most vertebrates (in particular, craniates) that supports the structures of the face and forms a protective cavity for the brain.The cranium and the mandible. The skull forms the anterior most portion of the skeleton and is a product of encephalization, housing the brain, many sensory structures (eyes, ears, nasal cavity), and the feeding system.