The symbol OM visually consists of three curves, one semicircle, and a dot.
The large bottom curve symbolizes the waking state, A.
The middle curve signifies the dream state, U.
The upper curve denotes the state of deep sleep, M.
The dot signifies the fourth state of consciousness, Turiya.
The semi circle at the top represents Maya and separates the dot from the other three curves. It signals to us that it is the illusion of Maya that is an obstacle to realization of the Highest.
2.2cm // 4.8gr