What is “Om”? Om (also Aum) is a mystical or sacred syllable in the Hindu, Jain and Buddhist religions. It is placed at the beginning of most Hindu texts as a sacred exclamation to be uttered at the beginning and end of a reading of the Vedas or previous to any prayer or mantra and also is said in the beginning of any puja (religious ritual). Within Buddhism, Om is principally associated with Vajrayana Buddhism, practiced in Tibet. Whatever its origins it is a wonderful chant because everyone can do it and it does produce an inner vibration that helps us to become grounded.