Pi is the number used to measure the size of circles. It means, rounded, 3.1415, but it goes on forever. Many computers are trying to unlock more digits. There are over 2.7 trillion digits known so far.
Pi is also the name of the main character from The Life of Pi.
If you divide the square of pi by the square root of zero, you get a huge epic fail and the universe is destroyed for sure.
One person was able to memorize more than 20,000 digits of it. However, it's nothing compared to a computer.