The three sounds in Om / AUM are said to represent the states of waking, dreaming and sleeping. The silence that surrounds Om represents the absolute bliss state of Turiya, where the self recognises their identity with the supreme.
In the traditional written symbol of Om, the various curves each have their own meaning and relate to those in the sound of the word.
* The large lower curve represents the waking world.
* The upper left curve represents the state of deep sleep.
* The curve coming off the two above states represents the dream state.
* The open semi-circle at the top represents the infinite and the point is linked to the state of absolute consciousness (Turiya).