Om (Auṃ or Oṃ, Sanskrit: ॐ) is a sacred sound and a spiritual icon in Indian religions. It is also a mantra in Hinduism, Buddhism and Jainism.
It is constituted of the sounds A (Aah), the deepest sound from within, U (Ooh) the middle sound from the throat, and M (Im) the sound from the outermost lips. Thus it denotes the Absolute Reality as the Beginning, Middle and End of all Beings.
In Hinduism, Om is a most important spiritual symbol (pratima). It refers to Atman (soul, self within) and Brahman (ultimate reality, entirety of the universe, truth, divine, supreme spirit, cosmic principles, knowledge). It is a sacred spiritual incantation made before and during the recitation of spiritual texts, during puja and private prayers, inceremonies of rites of passages (sanskara) such as weddings, and sometimes during meditative and spiritual activities such as Yoga.