I think its a Muslim symbol for the third eye on the other side.
Just kidding its not.
This is what the piece of paper that came with it said,"The HAMSA: Meaning five in Arabic, the hand-shaped Hamsa is a talisman that can be hung on a wall, worn as a pendant, or be put on a key ring to ward off the evil eye. Originating in Saudi Arabia, it represents the hand of Fatima, daughter of the Prophet Mohammed. She is revered by Muslins, who believe she can protect them from misfortune. This talisman was adapted by Middle Easter Jews, and was gradually accepted by Jews of different origins."