Labelled "The Great Monad" by Hampden Coit DuBose, The Dragon, Image, and Demon: Or, The Three Religions of China; Confucianism, Buddhism, and Taoism (1887), p. 357
books.google.com
Joseph A. Adler, Reconstructing the Confucian Dao: Zhu Xi's Appropriation of Zhou Dunyi, SUNY Press, 2014, p. 153
"The 'River Diagram' is the pattern of black-and-white dots which appears superimposed on the interlocking spirals [...] Those spirals alone form the Taiji tu or 'Diagram of the Supreme Ultimate', often known in English since the 1960s as the 'yin-yang symbol'.) These dots were believed to be collated with the eight trigrams, and hence with the concepts of roundness and of the heavens, while the equally numinous 'Luo River Writing' was a pattern of dots accosiated with the number nine, with squareness and with the earth."
Craig Clunas, Pictures and Visuality in Early Modern China (1997), p. 107.
