> Yeah I recall Sigma a lot in high school maths but I don't recall every
> seeing Pi in this context. I don't recall when I discovered it, but it
> was definitely after leaving education.

You obviously had much greater mathematical education than me then!

>> Then, today, I was poking around with MathML and saw the symbol on a
>> sample page, right-clicked and looked at the mark-up.
>
> Or you could have, you know, asked here :-)

What, to cries of GIYF?

Or is that only when *I* ask something? :-P

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