Om (or Auṃ [ə̃ũ] , Sanskrit: ॐ) is a sacred sound and a spiritual icon in Indian religions. It is also a mantra in Hinduism, Buddhism and Jainism. Om is part of the iconography found in ancient and medieval era manuscripts, temples, monasteries and spiritual retreats in Hindu, Buddha, Sikh and Jain Dharmas.he Om symbol, with epigraphical variations, is found in many southeast Asian countries. For example, it is called Unalom or Aum in Thailand and has been a part of various flags and official emblems such as in the Thong Chom Klao of King Rama IV.