What ⨏ means
The slash marks an integral normalized by its domain.
On an interval, that means dividing the definite integral by the interval’s length; for a multidimensional region, divide by its area or volume. The ordinary sign ∫ does not by itself specify that averaging.
Don't confuse it with
4Worth knowing
- A 2009 MathML 3 working draft treats ⨏ as a large operator before its expression, with upper and lower bounds that can move above or beside it according to the math style.
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 2A0F, 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 “integral average with slash”.
Linux
Ctrl+Shift+UType 2a0f, then Enter or Space.
HTML
⨏CSS
\2A0FLaTeX (unicode-math)
In math mode with the unicode-math package under XeLaTeX or LuaLaTeX, enter `\fint`.
Codes and encoding1 code points
HTML decimal
⨏
HTML hex
⨏
CSS content
content: "\2A0F";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A8%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.