What 뼛 means
A syllable inside Korean words, not a message.
Read 뼛 with its neighbors: in 뼛속 and 뼛골 it helps spell marrow, and in 뼛속 깊이 후회하다 it means remorse felt deep inside. The final ㅅ is 사이시옷, a compound-spelling marker, so 뼈속 without it is a misspelling.
What it means when someone sends it to you
3 readings뼛속이 시리다
Physical pain or cold felt in the marrow or bones.
뼛속 깊이 후회하다
Deep remorse, an inward feeling rather than a body-location claim.
뼛골이 쑤시다
A marrow-deep ache; a bodily complaint.
Questions people ask
1Why does 뼛 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 뼛
Windows (Word)
Alt+XType BF1B, then Alt+X to get 뼛.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “hangul syllable bbyeos”.
Linux
Ctrl+Shift+UType bf1b, then Enter or Space.
HTML
뼛CSS
\BF1BKorean 2-set
In Korean IME mode, press Shift+Q, U, then Shift+T; the IME composes 뼛.
Codes and encoding1 code points
HTML decimal
뼛
HTML hex
뼛
CSS content
content: "\BF1B";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%EB%BC%9B
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.