In Greek mythology, Io was a priestess who was seduced by Zeus, who changed her into a heifer to escape detection from his jealous wife, Hera.
In Dungeons & Dragons, Io is the chief deity worshiped by dragons, god of balance, and peace seen by his people as the creator of all things. He is neutral in alignment, but he contains within him all other alignments.
Usage
See Special:Whatlinkshere/Etymology:Io for a list of articles using this term.
This is an etymology page: a page detailing the origins of terminology used in the series in regards to real world culture and history.