What ⩏ means
Don't assume it means the same as .
Unicode 18.0.0 names it “double square union” but gives no rule or equivalence to . In set theory, ordinary union gathers all members of the sets being combined. For ⩏, use the definition supplied by the text that introduces it.
Related characters
2
Union
Giuseppe Peano used ∩ for intersection and ∪ for union in an 1888 work on geometric calculus. That history belongs to the familiar sign, not to ⩏’s origin or exact rule.
Double Square Intersection
Unicode names ⩎ “double square intersection,” the intersection counterpart suggested by ⩏’s name. Their paired names connect them, but do not define a shared notation.
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.
More like this
9
How to type or find ⩏
- Search it as
- Sqcup · square cup · union operator · LaTeX Sqcup
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
HTML
⩏CSS
\2A4FLaTeX with unicode-math 0.8r
In a XeLaTeX or LuaLaTeX document with unicode-math loaded, write
\Sqcup in math mode.Codes and encoding1 code points
HTML decimal
⩏
HTML hex
⩏
CSS content
content: "\2A4F";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A9%8F
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.