Guangyun
The Guangyun (Kuang-yun; ) is a Chinese rime dictionary that was compiled from 1007 to 1008 under the patronage of Emperor Zhenzong of Song. Its full name was "Dà Sòng chóngxiū guǎngyùn" (, literally "Great Song revised and expanded rhymes"). Chen Pengnian (, 961–1017) and Qiu Yong () were the chief editors. The dictionary is a revision and expansion of the influential "Qieyun" rime dictionary of 601, and was itself later revised as the "Jiyun". "Pingshui Yun" system, the standard for poetry rhyming after the Song Dynasty, is also based on "Guangyun". Until the discovery of an almost complete early 8th century  edition of the "Qieyun" in 1947, the "Guangyun" was the most accurate available account of the "Qieyun" phonology, and was heavily used in early work on the reconstruction of Middle Chinese. It is still used as a major source. The "Guangyun" has a similar hierarchical organization to the "Qieyun": The dictionary has a total of 26,194 character entries, each containing a brief explanation of the character's meaning. The Unihan database incorporates the "SBGY" ("Songben Guangyun"; "Song edition "Guangyun"") dataset with 25,334 head-entries for 19,583 characters.