The circle symbol meaning is universal, sacred and divine. It represents the infinite nature of energy, and the inclusivity of the universe.
To the northern Native American mind, the circle is the sun, the moon and her children (in terms of gender), man and woman. But, we should not get too literal with these definitions. The Native perspective is vastly deep. And so, the circle also embodies a spiritual energy (as all things – sun, moon, etc holds spiritual connotations – and so too would their symbolic expression). Consider the circle symbol meaning in conjunction with the Native medicine wheels.