"It began to advance, across the bridge built by Kuang Grade Mark Eleven and Case saw that it was walking."
Vishnu and his Avatars
Creative Commons AttributionVishnu and his Avatars - Credit: KaDeWeGirl

Avatar derives from Sanskrit: avatra, meaning descent of the God Vishnu into human appearance. 

In Second Life, the virtual online world, an avatar is a representation of a user's chosen virtual appearance.