Mao Collection, Upper Volume Radical: Heart (xīn) 悉 Kangxi strokes: 11 Page 386, Entry 32 Ancient form: 怸 Broad Rhymes (Guangyun), Collection Rhymes (Jiyun), Rhyme Collection (Yunhui), Correct Rhymes (Zhengyun): Pronounced xi (level tone). To exhaustively detail; to thoroughly investigate. To know. Also a surname. Six Writings Essentials (Liushu zongyao): Composed of Heart and Extract, it is an ideogram. Extract is an ancient form of the character for distinguish. It carries the meaning of taking that which is clear and distinct. It is different from the character for gather.