What 쀴 means
It is a Korean syllable block; context gives it meaning.
Hangul jamo (letter elements) ㅃ, ㅟ, and ㅆ form it in initial-consonant, vowel, final-consonant order. Unicode encodes the block as one character.
A 1443 entry in the Annals of King Sejong, a royal chronicle, first records Hangul's creation. Published in 1446, the Hunminjeongeum text explains its purpose and syllable rules. In the late 19th and early 20th centuries, Hangul's relationship with Hanja (Chinese characters used in Korean writing) shifted amid mixed writing, reform, and nationalism.
Neutral as a syllable; the surrounding Korean word supplies its meaning and tone.
Questions people ask
1Why does 쀴 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 쀴
쀴\C034Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.