What 큤 means
It is one syllable, not a complete message. “Kyuss” is a label, not a pronunciation guide. The block combines ㅋ, ㅠ, and ㅆ; final ㅆ ends like an unreleased t, but before a vowel it starts the next syllable as a strong s.
Hangul, the script used for Korean today, was devised in 1443 to make the language easier to write. Earlier writers adapted Chinese characters in systems such as Idu, Hyangchal, and Gugyeol. The songbook Yongbieocheonga (1445) is early Hangul evidence; Hunminjeongeum (1446) set out the script.
Questions people ask
1Why does 큤 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type 큤
큤\D064Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.