What 凵 means
It is a conversion form, not a separate everyday word.
Shuowen Jiezi, an early Chinese dictionary, glosses 凵 as an open mouth; Chinese character histories also link it to a hollow and 坎 (“pit”). These readings describe 凵, not 凵 itself.
The compatibility supplement preserves round-trip conversion with Taiwan’s CNS 11643-1992 standard.
Why does Unicode link 凵 to both 凵 and 𠙴?
They mark separate source and normalization links.
Unicode 18.0 links 凵’s Taiwan source glyph to 𠙴, while its normalization mapping remains 凵. This records a source distinction, not interchangeable word meanings.
Unicode normalization can reduce 凵 to 凵, erasing the exact encoded distinction.
Who writes 凵
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Questions people ask
1Why does 凵 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 or find 凵
- Search it as
- 凵 · 𠙴 · CNS 11643 · Unicode normalization
- Shows up in
- Anything that takes text · its shape is whatever your font draws
凵\2F81DCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

