What 쀶 means
It is a Korean syllable block, read within a word.
Hangul combines an initial consonant, a vowel, and sometimes a final consonant in one block. The syllable contributes a sound; its place in the word gives it meaning.
How did Hangul develop?
Hangul was designed to write Korean speech.
Earlier Korean methods Idu, hyangchal, and gugyeol adapted Chinese characters to write Korean; they are not forms of 쀶.
A 1443 record marks Hangul's announcement; a 1446 book explains its letters and combinations. Joseon designated it the national script in 1894. Japanese rule restricted its use; after 1945, it again became a foundation of Korean culture.
Questions people ask
1Why does 쀶 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 쀶
쀶\C036Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.