What ⨅ means
It combines several inputs by intersection. In set notation, the result contains only elements found in every input. In lattice notation, it can denote a meet: the greatest value less than or equal to all inputs under the ordering being used. The formula tells you what those inputs are.
Don't confuse it with
2⊓⋂
Square Cap
⊓ is the two-input square-cap sign; ⨅ marks the many-input operation. Check how many operands the formula groups under the operator.
N-Ary Intersection
⋂ is the usual sign for n-ary set intersection; ⨅ uses a square-cap form for a corresponding operation. Keep the notation chosen by the formula.
Questions 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 2A05, 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 “n-ary square intersection operator”.
Linux
Ctrl+Shift+UType 2a05, then Enter or Space.
HTML
⨅CSS
\2A05TeX with unicode-math
In math mode, enter \xsqcap if your unicode-math setup and font support the command.
Codes and encoding1 code points
HTML decimal
⨅
HTML hex
⨅
CSS content
content: "\2A05";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A8%85
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.