[Curiosity] Pi symbol used to represent sorting by relevance for code completion?

This is only a question to satisfy my curiosity. I recently noticed that when using code completion, the list of choices can be sorted alphabetically or by relevance. The symbol used for the former is an uppercase A, and the symbol used for relevance is a lowercase pi (π)

http://i.imgur.com/20DQllR.png

My question is, what does pi have to do with relevance, or sorting by relevance? Wikipedia doesn't seem to have any meanings listed that would fit the bill.

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