Windows
2 options- In Word / Outlook: type 222E then press Alt + X.
- Anywhere: press Win + . to open the emoji & symbol picker, then search.
Contour Integral Symbol
A symbol from the Math Symbols collection. Click the symbol or the button below to copy.
- Symbol
- ∮
- Unicode
- U+222E
- HTML entity
- ∮
- Category
- Math Symbols
Export
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Background
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19 of 96 in the math symbols collection
About the contour integral symbol
The contour integral symbol represents integration along a closed curve or loop in complex analysis and vector calculus. It indicates that the path of integration forms a complete loop, with the circle on the integral sign distinguishing it from an ordinary definite integral. This symbol appears primarily in advanced mathematics textbooks, research papers, and lecture notes covering topics like Cauchy's integral formula, residue theory, and line integrals in physics.
How to type Contour Integral
Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.
macOS
2 options- Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 222E.
- Or: Control + Command + Space opens the Character Viewer — search by name.
Linux
1 step- Press Ctrl + Shift + U, type 222E, then press Enter or Space.
Copy in every format
Every form of this character — for HTML, CSS, JavaScript, URLs and more. Click any value to copy.
Related math symbols
Other math symbols you can copy and paste — explore similar Unicode characters from the same family.
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- =Equals SignCopy the equals sign symbol→
- ≠Not Equal ToCopy the not equal to symbol→
- ≈Almost Equal ToCopy the almost equal to symbol→
- ≡Identical ToCopy the identical to symbol→
- ≤Less-Than Or Equal ToCopy the less-than or equal to symbol→
- ≥Greater-Than Or Equal ToCopy the greater-than or equal to symbol→
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