Yin and Yang (Taijitu)

The taijitu (太極圖, 'diagram of the supreme ultimate') represents the Taoist concept of yin and yang — two complementary, interdependent forces that give rise to all phenomena. The circular symbol is divided into two interlocking teardrop shapes, one dark (yin) and one light (yang), each containing a small circle of the opposite color. Yin represents qualities such as darkness, passivity, and femininity; yang represents light, activity, and masculinity. The symbol emphasizes that these forces are not absolute opposites but contain the seed of each other.

The taijitu in its familiar form was developed by Neo-Confucian philosopher Zhou Dunyi (1017–1073 CE) in his 'Taijitu shuo' (Explanation of the Diagram of the Supreme Ultimate).