What Om Means: The Mandukya Upanishad on A, U and M

The meaning of Om goes beyond a sacred sound or a symbol of spirituality. The Mandukya Upanishad, the shortest text in the Upanishadic tradition, explores the deeper significance of Om through its twelve verses. It explains how the three sounds A, U and M represent different states of consciousness and how the silence that follows points towards a deeper understanding of the self. This ancient Hindu philosophy offers a profound perspective on consciousness, existence and the nature of reality.

The Syllable as the Whole

The Mandukya opens with a statement that has no softening: Om is all this. The Sanskrit is terse, "Om iti etat sarvam", and the text means it literally. Not that Om represents the universe, but that the syllable and what it points to are the same thing. The Upanishad then asks what Om is made of, and answers with its three constituent sounds.

A: The Waking State

The first sound, A, corresponds to jagrat, the waking state. This is the consciousness that perceives the outer world through the senses. The text describes this as vaishvanara, the universal person who experiences gross objects. A is the first sound the mouth makes when it opens without shaping itself into anything else. In the Mandukya's scheme, waking experience is not the whole of consciousness; it is its first layer, the one most people take to be all there is.

U: The Dreaming State

The second sound, U, corresponds to svapna, the dreaming state. The text calls the dreamer taijasa, the luminous one, because in dream the mind generates its own objects from within, lit by its own light rather than by the sun. Where waking consciousness moves outward toward the world, dreaming consciousness turns inward and creates. The U sound rises from the A without a break, the way dream follows from waking without the dreamer choosing the transition. The Mandukya notes that U carries a sense of exaltation and intermediacy, it is neither the first nor the last.

M: Deep Sleep

The third sound, M, corresponds to sushupti, dreamless deep sleep. The text calls this state prajna, the unified knower, because in deep sleep all the multiplicity of waking and dreaming collapses into a single undifferentiated mass of bliss. The M is the closing sound, the lips coming together, the way deep sleep closes around experience. The Mandukya is careful here: prajna is not the final state. It is still a state, still bounded, still something that the deeper self witnesses.

The Silence After: Turiya

The fourth element is not a sound. The Mandukya calls it turiya, literally, the fourth, and says it cannot be described in terms of the other three. It is not waking, not dreaming, not deep sleep. It is the witness of all three, the awareness in which each state arises and passes. The text says turiya is not inward-turned, not outward-turned, not both, not neither. It is pure consciousness, the lord of all, the goal of all knowing. The silence at the end of Om, the moment after M fades and before the next breath, is where the text places turiya. The chanting of Om is therefore a movement through all four: from A through U through M into the silence that contains them.

The Mandukya's argument is that these are not four separate things. The three sounds and the silence are one syllable, and the four states of consciousness are one awareness. The text's final verse says that one who knows this enters the self through the self. The syllable is not a door to something else. It is a description of what is already the case.