ALD is Jewish in numerology (eliminates and prevents over man's detractors).
It is a way of averting and getting protection from the evil eye. It is believed that, in general, it could be a way of summoning assistance from the, "Hand of G-d."
The power of its symbolism remained intact through the centuries and to this day it is still a very popular good-luck charm, used throughout the Mediterranean world. The Hamsa (Arabic meaning "Five") is an ancient hand-shaped symbol of protection originating in the Middle East, predating Judaism, Christianity and Islam