Om is common in many eastern religions such as Hinduism, Buddhism, Jainism and Sikhism. It is used as a sacred mantra, chant and recognizable icon.
Om is believed to be a culmination of all the sounds in the universe. When said out loud correctly, it is broken into three syllables: A ("aah"), U ("ooh") and M ("mmm") and creates the vibration of earth's frequency. Each letter holds many meanings, for instance, 'the heavens, the earth and the underworld' or 'the waking, the dreaming and the dreamless states' or 'all that was, all that is and all that will be'.
It has mostly become acknowledged in western culture by the rise in popularity of yoga, with 'OM' often used as a chant during class. It is believed that when 'OM' is chanted, it is aligning our body, mind and spirit with the universe.
Om Meditation program uses a frequency very close to the basic vibrational frequency of Earth.