Qian (☰) and Kun (☷), the male and female principles.
Source: Jinye huandan yinzheng tu Pictures for the Verification of the Return of the Golden Liquor to the Cinnabar Field), by Longmei zi, early 13th century.
Taoist Internal Alchemy: An Anthology of Neidan Texts
This anthology presents translations of sixteen important works from the Taoist tradition of Neidan. The selections represent the major Neidan branches and lineages and are arranged chronologically, providing an overview not only of Neidan itself, but also of its historical development.
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