Eye of Horus
Horus is the son of Osiris and nephew to Set. After Set murdered Osiris, Horus and his mother Isis set to work putting the dismembered Osiris back together and reviving him as lord of the underworld. According to one story, Horus sacrificed one of his own eyes for Osiris. In another story, Horus loses his eye in a subsequent battle with Set. As such, the symbol is connected with healing and restoration.