What ⩃ means
MathML recorded it as a bar-and-intersection mark.
The 1998 MathML character table lists ncap in ISOAMSB, its group for added operators that combine two values, and describes the sign as “bar, intersection.” It used a placeholder from Unicode’s private-use area, reserved for characters without standard assignments; Unicode later assigned the same sign its own character ⩃.
Don't confuse it with
4Questions people ask
1Why does ⩃ 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 ⩃
Windows (Word)
Alt+XType 2A43, then Alt+X to get ⩃.
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 “intersection with overbar”.
Linux
Ctrl+Shift+UType 2a43, then Enter or Space.
HTML
⩃CSS
\2A43TeX (unicode-math)
With the `unicode-math` package loaded, use `\barcap` to typeset this character.
Codes and encoding1 code points
HTML decimal
⩃
HTML hex
⩃
CSS content
content: "\2A43";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A9%83
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.