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An irrational coin
Feeling irrational? It may be a sine to take some deep breaths and trace pi's digits by hand for a calming sensory experience.
The number pi (π) is a mathematical constant, approximately equal to 3.14159. It is defined i...
Reviews
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25 ratings
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Amazing detail
Love the PI coin—another wonderful design by Shire Mint. I looked at the number sequence on the back of the coin under a magnifier, and even the most minuscule of the numerals are cleanly stamped into the metal. Amazing.
J
J.C. · April 7, 2026
Nice chunk of copper
This is a great idea to have the answer to Pie anytime just don't eat it. It's a nice size and feels great in the hand. New lucky coin
D
David · November 18, 2025
Love these unique coins!
I bought one of these coins for my son while at the Shire Post Mint shop and he loved it so much, we ordered a couple more for his Math Olympiad teachers. Pi Day is a big celebration for them so this is perfect! Love the products and the excellent service at Shire Post Mint. My order came very quickly and wrapped with great care and a personal touch! Thank you!!