"One look and it was murder." These horrific hags were born of sea devils CETO and PHORCYS. That should give you a clue to their nature: green snaky hair and faces so horrible that just one glance in their direction will turn you to stone.
There are three of them — EURYALE, STHENO and, most famous of all, MEDUSA. Apart from their headful of writhing snakes, each of the GORGONS has a set of nasty cruel fangs and — somewhat incongruously — a rather splendid beard.
They hate everyone and everything, except their sisters the GRAEAE. Avoid at all costs.
Godchecker’s Gorgon Advisory: If confronted by Gorgon, avert eyes. Produce mirror from pocket. Show mirror to Gorgon. Her reflection will turn her to stone and she will perish. Return mirror to pocket. Give self well-deserved pat on back. Repeat as necessary.