Pi Day is a yearly celebration of that useful, yet irrational and never ending number (3.14159265359). Pi is used to calculate the ratio of a circle's circumference to its diameter. The number has become an integral part of geometry, trigonometry and physics. But for die-hard fans, pi is much more than that. It's a predictable challenge, a constant that has a wild sort of beauty.

Pi Day was first officially celebrated on a large scale in 1988 at the San Francisco Exploratorium. Since then, Pi Day has been celebrated by millions of students and math-lovers. The day is celebrated on 3/14, since 3, 1, and 4 are the three most significant digits in the decimal form of pi.

On the evening of Pi Day, March 14, here are some weird Pi gadgets, mobile cases, t-shirts and much more that you would have probably not seen before. Awaken the math geek within you with these awesome images in the gallery below.

Happy Pi Day!

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## Pi Kindle Case

## Pi Kindle Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Mobile Case

## Pi Pizza Cutter

## Pi Pizza Cutter

## Pi Shower Curtain

## Pi Shower Curtain

## Pi Ice Cube Tray

## Pi Ice Cube Tray

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