# \oiint symbol? How does it work? [duplicate]

How do I write the symbol for closed surface integrals? I need a contour double integral. $$\oiint$$

It doesn't seem to work... only for singles: $$\oint$$

• As this is a rare symbol it might not be available in MathJax. – quid Feb 10 '15 at 21:30
• @quid: Well done. – Asaf Karagila Feb 10 '15 at 21:40