- Root meaning: moonlight (dark) and sunlight (light). Yin later came to be associated with female, negative etc. Yang later came to be associated with male, positive etc.
- c. 479 BCE - 221 BCE: Confucius, 周易/系辞上#第五章 (Zhou Yi, Appended Words Part one, Chapter five)
阴阳 (simplified, Pinyin 陰陽), traditional
阴阳 (simplified, POJ im-iông or im-iâng, traditional 陰陽, simplified 阴阳)