A Korean King Designed an Alphabet to Look Like the Mouth Making the Sound

When King Sejong of Joseon promulgated a new alphabet for Korean in 1446, the explanatory manual that accompanied it, Hunminjeongeum ("The Correct Sounds for the Instruction of the People"), spelled out the design rules. Consonant letters were drawn to depict the shape of the mouth at the moment of articulation.

The letter ㄴ, the n sound, is the tongue pressing against the upper palate behind the teeth, drawn in profile. The ㅁ, m, is the closed lips seen from outside. ㅅ, s, is the narrowed teeth that produce a hiss. Aspirated and tensed versions are the basic shape with strokes added. A child can almost guess the relationships before being told.

The vowels work on a different principle, drawn from Korean Neo-Confucian cosmology. Three primal symbols — a horizontal line for earth, a vertical for human, and a dot for heaven — combine into a complete vowel inventory. The dot, in modern type, has flattened into a short stroke.

This was not how literate Koreans had been writing. The educated class used Classical Chinese, an entirely different spoken language, learned only after years of study. Hunminjeongeum opens by acknowledging this: "The sounds of our language differ from those of the Middle Kingdom." Sejong's alphabet was a tool to make literacy accessible to commoners.

The Confucian establishment dismissed it as eonmun, "vulgar script," suitable for women and children. For four centuries it stayed marginal. Hangul became the standard Korean writing system only after 1894, when modernising reformers and later anti-colonial nationalists embraced it as a marker of identity. It is now used by roughly eighty million people across two states.