[shabble]

I would love to see something like detexify: http://detexify.kirelabs.org/classify.html but that worked for unicode chars as well.

I think the guy who made it has some posts about how it works on his blog at http://detexify.posterous.com/ as well.

[evincarofautumn]

Try Shapecatcher (http://shapecatcher.com/). Could be improved, but hey, it works.