What 뿿 means
It is one Korean syllable, not a standalone word. Hangul blocks are built from jamo (letter components).
Hangul's creation was recorded in 1443; a guide to the new alphabet, Hunminjeongeum, appeared in 1446. Idu, hyangchal and gugyeol adapted Chinese characters to write Korean; these earlier methods are not visual ancestors of this block. In the modern period, Hangul became the main script for Korean.
Fonts may draw this block differently. An empty box means the active font lacks a glyph for it.
Questions people ask
1Why does 뿿 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 뿿
뿿\BFFFCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
