Zi Collection, Upper Volume Radical: Mouth (kǒu) Page 180, Entry 05 In the Broad Rimes (Guangyun), it is pronounced yi (falling tone). In the Collected Rimes (Jiyun), it is pronounced yi (falling tone). The pronunciation is yi (falling tone). In the Broad Rimes (Guangyun), it appears as a variant of the term representing a clear mountain stream.