I read "with a fake mustache" as just another way of saying "in disguise," not that it literally looks like a mustache
The mustache looks like "%"
It's syntax sugar for multiplication!
> The mustache looks like "%"
Yeah I got that, but I don't see how it looks like a mustache! Is the "/" a crooked filtrum and the each "o" one half of the stache?
Perhaps the "o"s are the eyes of a melting face with a fake mustache glued on between them. The melting face being an appropriate image for how much many people fear math, as if they've seen the face of Cthulhu or another Great Old One.
Or those Henry Moore statues that the author says are "moving". They all look like scenes from The Thing, with a twisted amalgamation of ambiguous body parts, except they're enormous and weigh two tons. I very much hope they won't start moving. Liking those statues goes along with thinking mathematics is lovely.