As the title says. Such a website would be very useful to test things out. Thanks.
4 Answers
The 'opposite' of Detexify is provided by Detexify itself. Instead of giving your input via drawing (which is the classify option), you can also enter in the commands and get the output in symbols instantaneously (which is the symbols option).
See below:
Command -> Symbol (Symbols option)
Drawing -> Commands (Classify option)
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I often make us of http://mathurl.com if I am after a quick preview. I don't believe that you can include any extra packages, so it is limited.
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Open texdoc comprehensive (some front-ends have a facility for this), look in the index of the PDF document you get on the screen for the command and you'll see its graphical representation(s).
Start of the document
Start of the index
Example of index
You can click on the page number, which is a link to the relevant font table, where you also get information about the needed package.
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texdoc comprehensive) and use the "find" option in the pdf file. – barbara beeton Jan 15 '17 at 20:33symbolstab in Detexify, you can key in the command and get the output symbol. – Troy Jul 06 '17 at 06:48