Hangul syllable Kyass

컀 is a written syllable, not a Korean word.

Hangul forms blocks from consonant and vowel letters, called jamo: ㅋ starts 컀, ㅑ is its vowel, and ㅆ closes it as the final consonant, or batchim.

King Sejong created Hangul in 1443; the 1446 Hunminjeongeum document explained its design and aim of making Korean writing accessible beyond Chinese-character literacy. It spread through religious, practical, official, and daily writing, became nationally official in 1894, and appeared in separate jamo sequences before 1933.