Moroccan House and Personal Charm: "Hamsa"

The hamsa hand (Arabic) or hamesh hand (Hebrew) is an old and still popular amulet for magical protection from the envious or evil eye. The words hamsa and hamesh mean "five" and refer to the digits on the hand. An alternative Islamic name for this charm is the Hand of Fatima, in reference to the daughter of Mohammed. An alternative Jewish name for it is the Hand of Miriam, in reference to the sister of Moses and Aaron.
The hamsa hand appears both in a two-thumbed, bilaterally symmetrical form, as shown, and in a more natural form in which there is only one thumb. Archaeological evidence suggests that the downward-pointing protective hamesh / hamsa hand predates both Judaism and Islam and that it refers to an ancient Middle Eastern goddess whose hand wards off the evil eye.
Source:
www.luckymojo.com/hamsahand.html