What ⨑ means
It marks an integral path taken anticlockwise.
On a closed path, the interior stays to your left; reversing direction reverses the integral's sign.
Leibniz used a stretched S for “sum” in a manuscript dated October 29, 1675; the notation appeared in print later in his work. ⨑ is a later member of that family.
Is ⨑ a contour integral?
No. ⨑ gives direction; a contour sign marks a closed path.
One specifies how the route is traveled; the other, that it closes.
Don't confuse it with
1Questions people ask
1Can fonts draw ⨑ differently?
Yes. Its strokes and proportions follow the font's design.
How to type ⨑
Windows (Word)
Alt+XType 2A11, 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 “anticlockwise integration”.
Linux
Ctrl+Shift+UType 2a11, then Enter or Space.
HTML
⨑CSS
\2A11HTML
Write `⨑`.
Codes and encoding1 code points
HTML decimal
⨑
HTML hex
⨑
CSS content
content: "\2A11";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A8%91
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.