Math & Pi Day
Pi Day and math-humour designs — the March 14 spike plus year-round teacher gifting.
Shop Math & Pi Day on SunFrog →Pi Day is March 14, written 3/14 in the US date format, which is the whole reason it exists. Maths teachers buy these in bulk for that week, and many wear them again for the start of term.
The jokes split into two kinds: real maths (irrational numbers, the pi symbol, equations that actually work) and pie-the-dessert puns. Teachers usually prefer the first; students and families the second.
Read the guide: Pi Day shirts.
Picks from Math & Pi Day
Find your favorite math & pi day design
Hundreds more designs are available on SunFrog — sizes and colors selected at checkout.
Shop the Full Collection →