dean's amulet
What is the symbol of Dean's amulet in Supernatural?

In the first season of the TV show Supernatural We get many insights into the Dean's Amulet, but I can never really find out what it is. Could someone tell me?

The link is a picture of the amulet … Dean Winchester was born Maria 24 January 1979 by John and Winchester. He always wears a brass amulet [1] on a long black cloth band necklace. While the significance of the necklace is unknown, it is here obviously important to Dean (Ackles has claimed in an interview that it is an Egyptian amulet of protection, but this has been) proved to be no episode.

Supernatural – Sam & Dean Amulet Possession Protection