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How to look up a symbol?

How can I get the "hooked" form of lowercase tau (see below) to show in posts in SE (Math, Theoretical CS, etc.)?


P.S. I tried the "obvious" \vartau, but no dice.

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    Have you seen it in any post? If so, which one? How about you edit the post and see what they used? There are options like \uptau and \tauup, both of which require additional fonts/packages which MathJax don't support natively. – Werner Jan 6 '12 at 6:08

For such concerns, have a look at Detexify², which will try to recognice a symbol you drew:

enter image description here

As you can see, it totally agrees with Mico.

You can also have a look at the following question: How to look up a symbol? It deals with the common problem of finding the code for a certain symbol.

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You're so close. Try loading the upgreek package and then typing \uptau.

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