Hangul
Letters

Letters in the Korean alphabet are called jamo (자모). There are 14 consonants (자음) and 10 vowels (모음) used in the modern alphabet. They were first named in Hunmongjahoe, a hanja textbook written by Choe Sejin. Additionally, there are 27 complex letters that are formed by combining the basic letters: 5 tense consonant letters, 11 complex consonant letters, and 11 complex vowel letters.

In typography design and in IME automata, the letters that make up a block are called jaso (자소).
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