pi is one of letters in greek alphabet.
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Wow, what a crappy answer you got.
Try this,
http://cogitosmath.wordpress.com/2010/02/26/interesting-pi-facts/
The most thorough list of pi tidbits that I have ever seen... because I WROTE IT as a consolidation of facts accumulated from around the internet.
I tried not to make it too mathy.
Chat with our AI personalities
Here are two fun facts: 1) The exact value of pi is infinite. It goes on forever. 2) The figure pi is present in the base of the Egyptian pyramids although the Greeks had not discovered it yet. Erich von Daniken suggested help from space aliens, but it is now thought that the Egyptians used a measuring wheel which incorporated pi without the Egyptians knowing it.
5 (five) which it is interesting you ask because, in 1687, a french mathmatian hypothesised it would be5..and he was correct
Every circular object, item, drawing will always be aligned with Pi - it will never change
(pi)(1/pi)=1.4396 ...
the same as pi squared, which is 9.86960440109