The "OM" (or "AUM") in Hindu faith is said to be the first sound the universe uttered as it came into existence eons ago. It is believed that the belief in this symbol brings good luck and spiritual power.
OM is the universal sound, the mother of all mantras, and represents the universal life energy that animates us all. It is the OM that unites all beings. It is the energy that exists in all things.

22 K Gold Vermeil on Unbreakable Thread