Double Spiral (Epona) Celtic Symbol - This is a sacred symbol of the Celtic goddess Epona. She is a horse goddess of Earth. Epona was invoked during the equinoxes (Autumn and Vernal) to bring about smooth passage of the seasons. These two seasons can be unsettling as they unfold upon the earth. As an overseer of the two equinox, . Each end of the spiral expresses a polarity. Left vs Right, Night vs Day, Death vs Life, Moon vs Sun, Good vs Evil, etc.