User blog comment:Roads/Rollercoaster: The Musical! Rating/@comment-3058214-20110213215032/@comment-5151799-20110213233632

I didn't type it. I just went to Wikipedia's infinity page and copied the symbol from there and posted it here. (Thus creating ∞ !) But seriously, there should be some super-keyboard with all the symbols on it; would make typing MUCH easier.