Because Pi is an irrational and transcendental number, calculating all of its digits is pretty much impossible, but that fact makes it a valuable weapon if you’re trying to defeat a runaway computer. In the classic Star Trek episode “Wolf in the Fold,” Spock used the uniqueness of Pi to get the crew out of a deadly dilemma.

The premise of this episode involves a disembodied, immortal, and evil alien consciousness briefly talking over the central computer of the starship Enterprise. This naturally puts the entire crew and the population of planet Argelius II in extreme danger. But the evil spirit still has to conform to the rules of the computer which is the loophole Spock needs to defeat it. He gives the haunted computer this order: “Compute to the last digit, the last value of Pi,” causing it to scream in agony. So, as the entire world celebrates Pi Day today (3.14) never forget the heroic usefulness of this never ending number.