What 쿁 means
Hangul arranges the consonant and vowel of a Korean syllable together in a compact block, with a final consonant when present. That layout lets each written block stand for one syllable within a word.
Hangul took shape in King Sejong’s court
King Sejong’s court developed Hangul to make Korean easier to write than it was with Chinese characters. The alphabet was created in 1443; Hunminjeongeum, the guide explaining the system, appeared in 1446.
In Korean texts from before 1933, Jamo can appear in sequences rather than in composed syllable blocks.
Questions people ask
1Why does 쿁 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 쿁
쿁\CFC1Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.