ㅎ

Etymology
The Hunmin Jeongeum Haerye, the treatise introducing the principles behind the Korean alphabet written by its inventor in 1446, explains that this glyph was derived by adding a stroke to  to represent aspiration.

Letter

 * 1) 히읗 (hieut), a jamo (letter) of hangul, the Korean alphabet.
 * ㅎ (hieut) is pronounced as a glottal fricative, i.e. similar to the English h.