Gray Sisters

The Gray Sisters are another trio of old hags, but this trio shares between them only a single eye and a single tooth. They are known as Anger, Tempest and Wasp. They are the operators of a taxi firm which services the Greater New York city and environs. Their taxi is "hailed" by throwing a golden drachma unto the street (in their service area). A gray taxi then materializes on that spot.

Annabeth hails the service when she, Percy and Tyson are running from the authorities after Percy is blamed for torching the school gym at Meriwether Prep.

They are also wise in strange ways and know where things are.