So, I'm not formally trained in mathematics at all. Normally, I can 
muddle through. I kept seeing the following mysterious symbol: Π

Err... what on earth?

Then, today, I was poking around with MathML and saw the symbol on a 
sample page, right-clicked and looked at the mark-up.

Product.

So.... essentially the same thing as Σ but with multiplication instead 
of addition.

Nice. Now I have to go back and find all of those formulae so I can 
actually understand them.
-- 
~Mike

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