Have you ever wondered why it takes two to go only one turn around a pie? Or why everywhere in math you see:

Euler’s Equation

or

Cauchy's integral formula

or

The Gaussian Distribution (aka the Bell Curve)

or

Stirling's Formula for approximating the factorial function

Looking at the $\latex \pi$’s in math, you’ll start to notice that more often than not, there are two ‘s, not just one.

People being what they are, they have gotten all ideological about it. They’ve defined

Here stands for “t”, as in “turn”, as in one is one turn of the circle. There is a movement afoot to use instead of in math. To the believers, today is Day (which makes March 14th Day). They have a manifesto, a website, a guru, media coverage, a T-shirt:

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