# How to insert a triple line integral?

A formula I want to typeset contains a tripple line integral, i.e. a symbol that has three integral signs that are encircled. How can I do this?

I tried `\oiiint`, but that does not work. `\iiint` works on the contrary.

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Have a look at “How to look up a math symbol?” for ideas how you can easily find a particular symbol. However, I can't find it myself using Detexify, but my mouse-drawing skills might be just to bad :-) – Martin Scharrer Mar 14 '11 at 17:28
Thanks, nice comment. – Ingo Mar 14 '11 at 17:32
@Martin: At the symbols link you can find out that the symbol isn't supported by Detexify, but you can send an e-mail to Daniel Kirsch. – Hendrik Vogt Mar 14 '11 at 17:34
@Hendrik: Thanks, it seems that it doesn't support the whole `mathdesign` package yet. – Martin Scharrer Mar 14 '11 at 17:39

The `mathdesign` package defines `\oiiint`, as do `txfonts` and `pxfonts` packages, according to the comprehensive symbols list.