It's All About the Number
PiDay Shirts is about having fun with math and pie and to share the fun of Pi Day (March 14) every day with shirts that inspire questions about math and science and yummy deserts! Our designs tend to be minimalistic (designed by an engineer, not a graphic designer)...some are unique and others are themes you may have seen before (there are only so many Pi puns out there). None of them are AI generated. All shirts are available on Etsy and are printed and fulfilled by Printful, one of the leading high quality print-on-demand providers.