Frequently Asked Questions

What is your return policy?

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.  Your satisfaction is our highest priority.  Pi Day is about having fun (and pie) and we don't want the day to be forever tainted for you because you are not happy with your Pi day shirt, so if you feel like you need to return it, especially for issues with quality or printing, please contact us through the contact page to start the return process and let us know the reason for your return. Return shipping is free.

How long does shipping take?

Because all shirts are made on-demand, total printing and shipping time ranges from 7-10 days, so order early so you get your shirt before Pi Day!

What is Pi?

The number π (/paɪ/ ^ⓘ; spelled out as pi) is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter. It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

The number π is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although fractions such as 22/7 are commonly used to approximate it. Consequently, its decimal representation never ends, nor enters a permanently repeating pattern. It is a transcendental number, meaning that it cannot be a solution of an algebraic equation involving only finite sums, products, powers, and integers. The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge. The decimal digits of π appear to be randomly distributed, but no proof of this conjecture has been found. (From Wikipedia)

What is Pi Day?

Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π, and was first celebrated in the United States.^[2][3] It was founded in 1988 by Larry Shaw, an employee of a science museum in San Francisco, the Exploratorium. Celebrations often involve eating pie or holding pi recitation competitions. In 2009, the United States House of Representatives supported the designation of Pi Day.^[4] UNESCO's 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019.(From Wikipedia)