Equal rhyme diagram - Touinzu (English spelling)

Japanese: 等韻図 - とういんず（英語表記）děng yùn tú

A syllable table from ancient China. It is also called a rhyme diagram, but strictly speaking it is a type of rhyme diagram. The vertical axis is the initial consonant, and the horizontal axis is the final syllable, with representative characters arranged in the corresponding positions by combining the vertical and horizontal axes. Depending on the main vowel and the intermediate syllable, the final syllable is classified by "etc.", such as first, second, third, fourth, etc., so it is called a "dong rhyme diagram." Taking the oldest surviving equal rhyme diagram, "Yunjing," as an example, the vertical rows are classified into boxes based on the place of articulation: labial, lingual, fang, dental, guttural, and lingual-dental (semi-lingual, semi-dental), and each box is further divided according to the clarity or voiced tone of the articulation method.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

中国の旧時の音節表。韻図ともいうが，厳密には韻図の一種。縦軸に声母，横軸に韻母をとり，縦横の組合せによって該当個所に代表字を配したものである。主母音および介母の違いによって，韻母を一等，二等，三等，四等のごとく〈等〉によって区分するので〈等韻図〉と称する。現存最古の等韻図《韻鏡》を例にとれば，縦の行は，唇音，舌音，牙音，歯音，喉音，舌歯音(半舌音，半歯音)の調音部位による枠に分類され，各枠内が調音方法による清濁の別によって細分される。

出典　株式会社平凡社世界大百科事典第２版について　情報

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