Taijitu (yin-yang)
Interlocking black and white — yin and yang, complementary opposites each holding the seed of the other.
Tradition: taoist, chinese · Period: Zhou Dunyi's Taijitu (11th c.); the dotted swirl form 14th–17th c. · Unicode: U+262F
Note: The yin-yang idea is ancient; the familiar swirl diagram is medieval (Song–Ming).
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Sources
Image: Public domain · Gregory Maxwell · source. Please keep this credit when you use it.