Pi Day | March 14 Annually

Pi Day is a fun holiday meant to celebrate the mathematical constant of Pi, or π. The event is observed each year on March 14, which is taken from the first three digits of Pi: 3.14. Pi Day was recognized by the U.S. House of Representatives in 2009 and UNESCO has designated Pi Day as the International Day of Mathematics in 2019. Shop funny Pi Day t-shirts here for math fans!

Pi T-Shirt 3,14 Pi Number Symbol Math Science Gift T-Shirt – If you love mathematics this sarcastic funny geek 3,14 tee is the one for you! Perfect for a birthday Pi day March 14 or Christmas present... View on Amazon
Inspire Pi TShirt 3.14 Math Teacher Pi National Day Shirt – Our Inspire Pi TShirt for Algebra Nerd,Teacher who Solve mathematical equations,3.14 Tee,Science Shirts,Ratio,Irrational Number T-Shirt,Calculus,Mathemagician,Mathletes Funny Gift Tees.Collect Accessories for him,her(hoodie,sweatshirt,pencil,hat,mug).; Great Girf TShirt for Kids... View on Amazon
I ate some Pi shirt it was delicious funny Math Pu – I ate some Pi shirt it was delicious funny Math Pullover Hoodie View on Zazzle
Women's Pumpkin Pi T Shirt Math Shirt Pie Thanksgiving Tee for Women (Heather Black) - M – SUPERIOR DESIGN: Crazy Dog T-shirt branded tees are designed and printed in the USA. We screen print our graphic tees with state of the art equipment... View on Amazon
Pi Day T-Shirt 3.14 Cool Funny Nerd Math Geek 2017 Rainbow – Great Stuff For Math lover or it could be a gift for your family, dad, mom, son, daughter, brother, sister, grandpa, grandma, uncle, aunt, grandkid, grandchild,... View on Amazon
My Password Is The Last 8 Digits Of Pi Gift Math P T-Shirt – Funny Gifts Idea for Men/Women/Kids on Pi Day party in 2021, March 14th, Birthday with funny saying - Fancy My Password Is The Last 8 Digits... View on Zazzle
My Password is Pi Funny Math Nerd T-shirt for Teac – My Password is Pi Funny Math Nerd T-shirt for Teachers View on Zazzle
Pi Math Tshirt 10000 Numbers Science Physics – quantum View on Zazzle
Pumpkin Pi Math Teacher T-Shirt – What you get if you divide a pumpkin's circumference by its diameter? Pumpkin pi!' halloween tee for math teachers. This funny is will have the whole... View on Amazon
THANKSGIVING NERD PIE PI MATH MATHEMATICS MENS WOM T-Shirt – THANKSGIVING NERD PIE PI MATH MATHEMATICS MENS WOMENS KIDS GIFTS for PI Thanksgiving Pie Cake friends, teacher, mom, dad, grandma, grandpa, family, colleagues in the office.... View on Zazzle
Sweet as PI t-shirt – What girl wouldn't want to be compared to an irrational number? View on Zazzle
Cool Math Teacher Pi Digits T-Shirt – Lightweight, Classic fit, Double-needle sleeve and bottom hem. View on Amazon
Pi Spiral Novelty Math Geek 3.14 Pi Day T-Shirt – Celebrate Pi Day in style on March 14th. Fun nerdy geeky math pi day gift for math majors, math teachers, science nerds, math geeks, math club... View on Amazon
Pumpkin Pi T-Shirt – What's a mathematician's favorite holiday food? Perfect for the math and science lover in your life. View on Zazzle
Funny Pi Day Shirt Spiral Pi Math Tee for Pi Day 3.14 T-Shirt – Cool pi day 3,14 mathematical ratio 3,14159 greek letters irrational number geek nerd math mathematic mathematician algebra science symbol geometry pun school student apparel; THIS IS... View on Amazon
Funny PI Mirror image of 3.14 is PIE Thanksgiving Math Gifts T-Shirt – This funny PI outfit featuring a mirroir image 0f 3.14 is PIE is perfect for mathematics teachers and students in thanksgiving and Pi day, it's showing... View on Amazon
Pi Day Leopard Math Teacher T-Shirt – Pi Day Leopard Math Teacher View on Zazzle
Pi Sunflower Graphic Math Teacher Back To School_f T-Shirt – Pi Sunflower Graphic Math Teacher Back To School_fullprint View on Zazzle
Pi Day Math Equation T-Shirt Math Teacher Student Geek Gifts – Cool Gift Idea for Women / Men / Kids - Pi Day Math Equation Shirt. Great present for science nerds, geeks, mathletes, engineer genius, mathematicians, mathematic... View on Amazon
Pi 3,14 Pi Number Symbol Math Science T-Shirt – Pi 3,14 Pi Number Symbol Math Science. View on Zazzle
I Ate Some Pi, and it was Tasty | Funny Delicious Math Teacher Humor Pun T-shirt-2XL Black – MICHIGAN ARTISTS & PRINTERS | this design was drawn and screen printed (silk screened) with pride by our skilled illustrators and printers in Ann Arbor. If... View on Amazon
Quirky Pork Pie Symbol Cufflinks – For pork pie lovers a realistic looking pork pie on novelty cufflinks. View on Zazzle
Come To The Math Side We Have Pi - Math Geek & Nerd T-Shirt – Come To The Math Side We Have Pi is a funny Math nerd/geek Pi Day shirt for kids, youth, boys, girls, men, and women. math teacher... View on Amazon
PI Day T Atom PI Math Geek Science Lovers T-Shirt – making soap View on Zazzle
I Ate Some Pie And It Was Delicious - I Ate Some Pi Math T-Shirt – Lightweight, Classic fit, Double-needle sleeve and bottom hem. View on Amazon
Math + Pumpkin = Pi T-Shirt – This premium item is as close to perfect as can be. It's optimized for all types of print and will quickly become your favorite product. Soft,... View on Zazzle
Funny Pi Day Shirt Spiral Pi Math Tee for Pi Day 3.14 T-Shirt – Cool pi day 3.14 mathematical ratio 3.14159 greek letters irrational number geek nerd math mathematic mathematician algebra science symbol geometry pun school student apparel; PLEASE CLICK... View on Amazon
It Just Keeps Going And Going On Pi Day Math Lover T-Shirt – Imported Machine Wash Subject, Math, Maths, Mathematic, Pi, Pi Day, March 14, Happy Pi Day, Student, Teacher, Education, Educator, Pi Day gift, Pi Day tee. If you are looking... View on Zazzle
Pi Math 10000 Numbers Science Physics T-Shirt – chemist View on Zazzle
Pumpkin Pi Pie Math Pi Day Thanksgiving Halloween T-Shirt – Pumpkin Pi Pie Math Pi Day Thanksgiving Halloween. View on Zazzle
Pi 3.14 First 2,000 Digits of Pi Math T-Shirt for Pi Day – This apparel is printed using the actual first 2,000 digits of Pi. Pi Day is celebrated on March 14th all around the world. Pi is the... View on Amazon
"My Password is Pi" Funny Math Nerd T-shirt for Teachers – Funny Pi-Day math shirt for students, teachers and software engineers. Wear it to work at the IT department, school, math club or competitions. Great gift for... View on Amazon
THANKSGIVING NERD PIE PI MATH MATHEMATICS MENS WOM T-Shirt – THANKSGIVING NERD PIE PI MATH MATHEMATICS MENS WOMENS KIDS GIFTS for PI Thanksgiving Pie Cake friends, teacher, mom, dad, grandma, grandpa, family, colleagues in the office.... View on Zazzle
Pi 3.4 Number Symbol Pi Math T-Shirt – Pi 3.4 Number Symbol Pi Math View on Zazzle
Mathematician Captain Pi Superhero Math Nerd Geek Pi Day T-Shirt – The captain pi superhero shield, funny math pi day design, makes an excellent gift for mathematics geeks and nerds.; This mathematician design is excellent for teachers... View on Amazon
Octopi Science Math Pi Funny Great Gift For Teachers Tee – Lightweight, Classic fit, Double-needle sleeve and bottom hem. View on Amazon