I was curious (even though this is a very amateur question)... what would the multiplication equivalent of sigma (the summation symbol) be? $$\sum$$ I want to do a series of multiplication of terms.... instead of addition...
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It's a capital pi (for product): $\prod$. You can sometimes find useful symbols and guess what they mean from their $\LaTeX$ names, although I guess the most reliable way to find useful, well-known symbols is just to read a lot of math.
I google "latex symbols" when I need something I can't recall. That'll give you many lists and tips. For example, if you choose the first hit, the AoPS list and look for the sum symbol you'll find the product symbol right below it. This is but a simple example of a general technique of exploiting organization and classification on the web to discover information about similar items.