The Gray Sisters (also spelled Graeae, Graiae, Graiai, Graii) are a trio of old women who share among them a single eye and a single tooth. They are known as Anger (Deino), Tempest (Persis or Perso), and Wasp (Pemphredo). They are the operators of a "taxi firm" which services the Greater New York City and its inhabitants. They are the daughters of Keto and Phorcys (or Phorkys), and are the sisters of the Gorgons, Ladon, and Echidna.