From the Sanskrit Om, the sacred syllable in its written form. It is the vital vibration that fills the universe and according to the Upanishads represents the Divine and the power of God. A sonorous symbol of the ultimate Reality, its three letters A, U and M represent, respectively, the states of external, internal and superconscious consciousness, as well as the three states of man, (awake, sleep and deep sleep), the three parts of the day (morning, afternoon, evening, night) and the three capacities (to act, to know, to desire). Beyond is the formless state of the Self, according to Advaita Vedanta. It is considered enduring and inexhaustible and is interpreted, in part, as a representative expression of the creative spirit, the word.