What ⩋ means
Its name describes a shape, not a formula's rule. The notation using ⩋ must define what operation it represents; the glyph alone does not settle the formula's meaning.
When was ⩋ included in the math-symbol proposal?
In 2000. A proposal for additional mathematical symbols included ⩋ in a wider effort to support mathematical, scientific, and technical publishing and exchange. This records its standardization context, not the sign's first appearance.
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 2A4B, 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 beside and joined with intersection”.
Linux
Ctrl+Shift+UType 2a4b, then Enter or Space.
HTML
⩋CSS
\2A4BMathML 2 entity `capcap`
Use `⩋` where the MathML 2 named-entity set is supported; it represents ⩋.
Codes and encoding1 code points
HTML decimal
⩋
HTML hex
⩋
CSS content
content: "\2A4B";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A9%8B
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.