Om, also written as Aum, is a mystical and sacred syllable that originated from Hinduism but is now common to Hinduism, Sikhism, Jainism, Buddhism and the Bön faith. … Many wear the sign of Om as a pendant, and it is the first syllable of the sacred mantra “Om mani padme hum”.
Om or Aum is a mantra that is often chanted at the beginning and end of yoga sessions. Om is both a sound and a symbol rich in religious meaning and depth. It is said to be both the sound of the creation of the universe, and the sound of silence.