This tag is for challenges involving the mathematical constant pi, the ratio of a circle's circumference to its diameter.
Pi (π or \$\pi\$) is a mathematical constant, representing the ratio of any circle's circumference to its diameter. It also appears in a number of other formulas in mathematics and physics.
Pi is irrational, and the approximation 3.14 is often used. Challenges using this tag might involve generating digits of pi, using its digits in some base to solve a challenge, or performing some mathematical operation involving it.