ㅎ

The Hunmin Jeongeum Haerye, the treatise introducing the principles behind the Korean alphabet written by its inventor King Sejong in 1446, explains that this glyph was derived by adding a stroke to ㆆ (Yale: q, Middle Korean letter denoting the glottal stop) to represent aspiration.

ㅎ • (h)

1. 히읗 (hieut), a jamo (letter) of hangul, the Korean alphabet.

   ㅎ (hieut) is pronounced as a glottal fricative ([h]), i.e. similar to the English h.