Wu Collection, Lower Volume Radical: Cave (xué) Yin Kangxi stroke count: 14 Page 866, Entry 59 According to Tang Rhymes (Tangyun), Collection of Rhymes (Jiyun), and Rhyme Compendium (Yunhui), the pronunciation is yin. According to Explaining Graphs and Analyzing Characters (Shuowen), it is an underground room. Nowadays, storing wine in a cellar is called yin. According to the Commentary on the Annals of Emperor Guangwu in the Book of the Later Han (Hou Hanshu), a silkworm chamber is an yin chamber. Furthermore, according to the Collection of Rhymes (Jiyun), it is also pronounced yin (yīyín). The meaning is the same. Furthermore, according to the Collection of Rhymes (Jiyun), it is pronounced yin (yújīn). Yin means black.