In Ancient Greece a Gorgoneion (or stone head, engraving, or drawing of a Gorgon face, often with snakes protruding wildly and the tongue sticking out between her fangs) frequently was used as an apotropaic symbol and placed on doors, walls, floors, coins, shields, breastplates, and tombstones in the hopes of warding off evil.
In this regard Gorgoneia are similar to the sometimes grotesque faces on Chinese soldiers’ shields, also used generally as an amulet, a protection against the evil eye. Likewise, in Hindu mythology, Kali is often shown with a protruding tongue and snakes around her head.
In Greek mythology, blood taken from the right side of a Gorgon could bring the dead back to life, while blood taken from the left side was an instantly fatal poison.
Athena gave a vial of the healing blood to Asclepius, which ultimately brought about his demise.
Heracles is said to have obtained a lock of Medusa’s hair (which possessed the same powers as the head) from Athena and to have given it to Sterope, the daughter of Cepheus, as a protection for the town of Tegea against attack.
According to the later idea of Medusa as a beautiful maiden, whose hair had been changed into snakes by Athena, the head was represented in works of art with a wonderfully handsome face, wrapped in the calm repose of death.