Avatar

Avatar: Wikipedia:
An avatar (abbreviations include AV, ava, avv and avvy) is an Internet user's representation of himself or herself, whether in the form of a three-dimensional model used in computer games,[1] a two-dimensional icon used on Internet forums and other communities,[2][3] or a text construct found on early systems such as MUDs. The term "avatar" can also refer to the personality connected with the screen name, or handle, of an Internet user.[4]

Avatar: Hindu pholosphy:
In Hindu philosophy, an avatar, avatara or avataram (Sanskrit: अवतार, avatāra), most commonly refers to the incarnation (bodily manifestation) of a higher being (deva), or the Supreme Being (God) onto planet Earth. The Sanskrit word avatāra- literally means "descent" (avatarati) and usually implies a deliberate descent into lower realms of existence for special purposes. The term is used primarily in Hinduism, for incarnations of Vishnu whom many Hindus worship as God. Shiva and Ganesha are also described as descending in the form of avatars, with the Ganesha Purana and the Mudgala Purana detailing Ganesha's avatars specifically.

The word has also been used by extension to refer to the incarnations of God or highly influential teachers in other religions, especially by adherents to dharmic traditions when explaining figures such as Jesus or Muhammad.

Avatar: Web Answer:
An Avatar is a small image used in Forums, Mobile Phones, Instant Messenger programs (IMs), PDAs etc. to identify yourself or your contacts.In Forums Avatars, are usually displayed to the left of your post, directly beneath your Username.In IMs, Mobile Phones, PDAs etc. Avatars are used to show your caller a graphical representation of who they are talking to and/or, as part of the phonebook/address entry.

Check out the description on "The Avatar Site"
http://www.avatara.org/essay.html