According to Swami Sivananda, in his book “Meditation on OM”, “All languages and sounds come out of OM. The essence of the four ancient Indian Vedas is OM only. The OM (AUM) sound covers the entire range of verbal sound vibration. A (AH) starts from the root of the tongue. U (OO) proceeds from the middle. M (MM) designates the end by closing the lips. He/She who chants “OM” repeats the sacred books of the whole world. OM is the source/womb for all sacred scriptures in different parts of the world.” (Meditation on OM, pages 38 – 39). Thank You, Swami. Namaste.