This symbol is the Sanskrit letter representing Ohm (Om). According to the yogis this symbol represents all that was, all that is and all that will be.

The long lower curve represents the dream state, the upper curve represents the waking state and the curve coming from the center to the right represents the deep dreamless sleep between. Interestingly, the figure is shaped like the number 3, representing the 3 states of being. The crescent shape above represents "maya" or the veil of illusion, and the dot above the crescent represents the transcendental state. When one's spirit passes through the veil and rests in the transcendental, liberation from the 3 states occurs.

The Om symbol represents the possibility of transcendance to Source.