Eris
     n : (Greek mythology) goddess of discord; sister of Ares
Source: WordNet® 2.0

Eris /e'ris/ n. The Greek goddess of Chaos, Discord, Confusion, and
   Things You Know Not Of; her name was latinized to Discordia and she was
   worshiped by that name in Rome. Not a very friendly deity in the
   Classical original, she was reinvented as a more benign personification
   of creative anarchy starting in 1959 by the adherents of {Discordianism}
   and has since been a semi-serious subject of veneration in several
   `fringe' cultures, including hackerdom. See {Discordianism}, {Church of
   the SubGenius}.


Source: The Jargon File