Yin Yang necklace on a smooth leather lace complete with lock.

Yin and yang (☯) are Chinese concepts referring to two opposing principles or forces of which all aspects of life and the universe are pervaded. The yin-yang symbol is the ancient Chinese conception of the cosmic duality, where yin femininity (earth, cold, north, humidity) symbolizes masculinity and yang (sky, heat, south, drought). But it is not merely opposites, but mostly complementary (complementary) values.