Think Geek by Request.
What is Pi? Some might define it as the ratio of a circle's circumference divided by its diameter. Others might think it's an irrational number that's impossible to know completely. Still others might think it's a mystical, transcendental, almighty number that will only finally be revealed when society as a whole puts on a bunch of purple felt jump suits and hitches a ride on a nearby comet. Those people aren't reading this description though. They are browsing the howtothinklikeaflower.com website. But we digress...

Metro blue 100% cotton heavyweight t-shirt with the Pi symbol on it. The first 4493 digits of Pi were used to construct the Pi symbol itself. That's a whole lot of Pi. Enough for everybody to share so don't get greedy on us now.
Want a different Thinkgeek T? well send me a message with the url and i'll do it!