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Similar visual search for LaTeX characters: http://detexify.kirelabs.org/classify.html

First thing I thought of when I saw Shapecatcher was Detexify. The similarities are obvious, it was most likely his true inspiration, or at least part of it, yet he didn't mention in the about page.

I just ran across detexify today while trying to remember what \gtrsim was called... Quite a coincidence to find the unicode equivalent on HN a few hours later.

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