Read an article on Yin and Yang
Yin (black) and Yang (white). The two inner dots represent Yin within Yang and Yang within Yin. Around the circumference are shown the eight trigrams (bagua), which here represent different stages in the cycles of increase and decrease of Yin and Yang (clockwise from the lower left corner: Zhen ☳, Li ☲, Dui ☱, Qian ☰, Sun ☴, Kan ☵, Gen ☶, and Kun ☷).
Source: Hu Wei (1633–1714), Yitu mingbian
(Clarifications on Charts Related to the Book of Changes; 1706), chapter 3.
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