What 퓈 means
It marks one written syllable inside a Korean word.
King Sejong’s court created Hangul so people without Chinese-character education could read and write Korean. The name Hunminjeongeum appears in Sejong Sillok, the royal annals, in 1443; an explanatory book followed in 1446. Earlier, Idu, Hyangchal, and Gugyeol used Chinese characters to write Korean; they are attested from the mid-sixth century.
Elites resisted Hangul, but palace women and commoners adopted it. During Japanese rule, the alphabet became tied to Korean language and identity.
Questions people ask
1Why does 퓈 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 퓈
퓈\D4C8Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.