Aum (also Om, ) is the most sacred syllable in Hinduism, symbolizing the infinite Brahman and the entire Universe. This syllable is sometimes called the "Udgitha" or "pranava mantra" (primordial mantra), because it is considered to be the primal sound, and because most mantras begin with it.

The symbol of Om contains of three curves, one semicircle and a dot. The large lower curve symbolizes the waking state; the upper curve denotes deep sleep (or the unconscious) state, and the lower curve (which lies between deep sleep and the waking state) signifies the dream state. These three states of an individual’s consciousness, and therefore the entire physical phenomenon, are represented by the three curves. The dot signifies the Absolute (fourth or Turiya state of consciousness), which illuminates the other three states. The semicircle symbolizes Maya and separates the dot from the other three curves. The semicircle is open on the top, which means that the absolute is infinite and is not affected by maya. Maya only affects the manifested phenomenon. In this way the form of Om symbolizes the infinite Brahman and the entire Universe and the world. Aum is made out of the three gods Shiva and Ganesh and Gayatri.