Datatype — variable font that turns text into charts

This is incredible: "Datatype is an OpenType variable font that turns simple text expressions into inline charts. No JavaScript, no images, no rendering library — just type the syntax and Datatype's ligature substitution does the rest." It's so cool, in fact, that even though I don't have an obvious need for it, I'd be fully willing to invent a use case for this site just to implement it.