This symbol is referred to "Ouroboros ". This symbol explains the cycle of the universe, life out of death phenomenon, and unending natural cycles. For more details, you can visit the following links:

http://www.mu6.com/uroboros.html


http://www.crystalinks.com/ouroboros.html


http://en.wikipedia.org/wiki/Ouroboros

 This is a mythological symbol for immortality.

 This symbol means something very powerful... You can also find a whole new meaning by playing a Nancy drew game... The curse of black moor manor. One of its meanings is for immorality