The story
Borrowed from Mandarin 陰陽／阴阳 (yīnyáng), from Middle Chinese 陰陽 (MC 'im yang), from Old Chinese 陰陽 (OC *qrɯm laŋ), from 陰 (“dark” → “negative force”) + 陽 (“bright” → “positive force”).
Etymology from Wiktionary, CC BY-SA 4.0.
yin-yang
Today it means: Yin and yang. Full definition →