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