The study or set of rules for the standard pronunciation of words in a language, used to unify and correct spoken form.

An important 14th-century manual on Northern Drama and Sanqu poetry written by Zhu Quan of the Ming dynasty; it serves as the earliest surviving guide to the musical scales, prosody, and history of Northern music.

The 1446 document promulgated by King Sejong the Great to introduce the Korean alphabet (Hangeul); the original name for the Hangeul script