Zi Collection, Middle Volume, Page 314, Entry 06 In the Zihui Bu (Zi Hui Bu), this character is the same as the character yu (yù). In the Shi Gu Wen (Shi Gu Wen), it is recorded as "ji yun ji shi." Feng Ya Guang Yi (Feng Ya Guang Yi) believes this character differs slightly from the character yun (yùn).