The term 'Female Principle' can be summarized as the concept of Yin, which is a three-letter Chinese word. It is a philosophical concept that is part of the Taoist belief system and is used to describe the feminine aspect of the universe. Yin is seen as the dark, passive, and receptive side of the universe, while Yang is seen as the bright, active, and creative side. Together, Yin and Yang represent the balance of the universe.