'Om Shanti Om' is a mantra that means 'Om, Peace, Peace, Peace'. In Hinduism and Buddhism, 'Om' is considered the sound of the universe and represents the divine. 'Shanti' means peace. The repetition of 'Shanti' three times is intended to invoke peace in the body, mind, and spirit, as well as to create peace in the world around us. It's a popular mantra for meditation and promotes inner harmony.