Wei Collection, Middle Volume Radical: Silk (mì) Kangxi Strokes: 12 Page 923, Entry 12 Pronounced yin. Yin-yun, the primordial energy. Book of Changes (Yijing), Treatise on the Appended Remarks: When heaven and earth are in a state of yin-yun, the ten thousand things transform and flourish. According to the Explication of Text, yin-yun is also written in the variant form yin-yun. Also, Book of Former Han (Qian Hanshu), Biography of Huo Guang: Added embroidery and a mattress (yin). Commentary by Ru Chun says: Yin is also a mattress (yin). Also, in the Broad Rhymes (Guangyun): Yin-yun, hemp and flax.