I've been using "detexify" since grad school which was a decade ago or so. It's by far the best tool for LaTeX I've ever used. You just have to draw the symbol

I've been using "detexify" since grad school which was a decade ago or so. It's by far the best tool for LaTeX I've ever used. You just have to draw the symbol and it uses pattern recognition algorithms to suggest the closest LaTeX keyword.