The udjat (or wedjet) eye was one of the most popular ancient Egyptian symbols.  It was the eye of the god Horus; the eye looks human with hawk aspects.  According to myth, Horus lost his eye to Seth, god of chaos and destruction, in a battle for the rule of Egypt.  Horus's eye was replaced or repaired by Thoth.  In some accounts, he gifted this eye to Osiris, his father, to help bring him back to life following his murder by Seth.  The udjat was a symbol of healing and regeneration; it was a popular amulet to be tucked into mummy wrappings or painted on breastplates or sarcophagi.