Pi is a number. You might know it as 3.14 or the symbol π. But it's way more than that!
Pi is an irrational number. That means it goes on forever and it never repeats its sequence of numbers. Pi has been calculated to more than one trillion digits!
Pi is the circumference of a circle divided by the circle's diameter. Pi is the same for any circle, no matter how big or small. It is a mathematical constant.
