韻圖嘅聲母通常有兩種標注方式：好似上圖《韻鏡》噉採用「牙音」、「清」、「濁」之類嘅可稱作五音或七音類。另有就是直接用字母嘅，多用三十六字母。七音、五音、清濁之類啲概念繁雜難懂，具體含義請參考下表「三十六字母」中嘅標目。必要的說明見表下附註。
There are usually two ways to mark the initials of a rhyme diagram: "tooth", "clear", "voiced", etc., as in the "Rhyme Mirror" above, which can be called pentatonic or seven-tone type. The other is to use letters directly, and more than 36 letters are used. The concepts of seven tones, five tones, and voiced sound are complicated and difficult to understand, please refer to the headings in the table below under "36 letters" for specific meanings. The necessary instructions are provided in the notes under the table.