March 14 is Pi Day — that’s pi, not pie — and today, Google marks the 30th anniversary of the math-inspired holiday with a special Doodle.
Pi Day honours the mathematical constant, Pi - which is notated by the Greek letter "p".
Pi Day, commemorated on March 14 every year, honours the first three digits of this infinite figure, 3.14.
"First recognized 30 years ago in 1988 by physicist Larry Shaw, Pi Day observers often celebrate with a slice of their favourite pie in honour of the number's delicious sounding name," Google wrote in its blog post.
"Today's delectable Doodle - baked & built by award-winning pastry chef and creator of the Cronut Dominique Ansel - pays homage to this well-rounded mathematical constant by representing the pi formula (circumference divided by diameter) using - what else - pie!," it added.