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Yeah yeah yeah... every l33t Mac hax0r knows how to use the option key. Great! But guess what? People program on Linux and Windows too, and the fact is that it's a hell of a lot easier to type "fn" than it is to type ∑Ò™£‹˙√«»ç◊... where the hell is the key for lambda?

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And that sigma that you led off with is the mathematical summation sigma and not the Greek letter. This gets really really hard cross-platform. (On Windows, your best bet for typing summation sigma requires a registry hack.)

>the mathematical summation sigma and not the Greek letter

I'm prepared to be corrected but ..

Greek capital sigma is the mathematical "sum" symbol just as capital pi is the product symbol.

While they are the same, in Unicode, the codepoint U+2211 is summation, U+03A3 is capital letter sigma.

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