What ⌓ means
It marks the region between a circle’s arc and its chord. The chord is the straight line joining the arc’s endpoints; together they bound a circular segment, also called a disk segment.
A geometry translation linked to the medieval scholar Savasorda uses an arc mark in the twelfth century. In 1647, the Italian mathematician Bonaventura Cavalieri marked a straight segment by writing a bar over AB. These are earlier examples of geometry notation, not the exact character ⌓.
Don't confuse it with
1Questions 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 2313, 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 “segment”.
Linux
Ctrl+Shift+UType 2313, then Enter or Space.
HTML
⌓CSS
\2313Unicode input
In a code-point picker, enter U+2313; in source code, `\u2313` works only in languages that support that escape.
Codes and encoding1 code points
HTML decimal
⌓
HTML hex
⌓
CSS content
content: "\2313";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%8C%93
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.