Aegis, in Greek mythology, is often depicted as a protective shield or breastplate associated with Zeus and Athena. It is characterized by its formidable power to instill fear and provide protection in battle. The aegis is traditionally embellished with the head of the Gorgon Medusa, symbolizing its invincible and terrifying nature. As a symbol, it represents divine authority and invulnerability, becoming an iconic image in various artistic and literary works throughout history.