Yin and Yang is one of the most fundamental concepts in Traditional Chinese Medicine, as it is the foundation of diagnosis and treatment. The earliest reference to Yin and Yang is in the I Ching (Book of Changes) in approximately in 700 BC. In this work, all phenomena are said to be reduced to Yin-Yang.
Translations: 1. female, passive, negative principle in nature 2. the moon 3. shaded orientation 4. north or shady side of a hill 5. south of a river.
Translations: 1. positive, active, male principle in nature 2.