hatha

Although the Sanskrit roots do not support this view, it is often said that ha means the sun and tha means the moon. Actually this is not the case, any more than the Chinese word yin means the moon or yang means the sun. Technically ha and yang both represent the masculine or solar principle in all polarities while tha and yin both represent the feminine or lunar principle in all polarities. The term Hatha Yoga therefore, would refer to the integration of (apparent) opposites into a more complete union or whole.