Did you realize today is Pi Day? No! Well, now you know! How are you celebrating? So, why is today tagged Pi Day (π), you ask? Well, here’s the explanation: “March 14 the approximation for Pi(π): 3.14.” Intuitive, no? Pi (π) is of course a Greek letter, but it is also the symbol for the ratio of the circumference of a circle to its diameter. Too, Pi (π) is an irrational number. Irrational numbers continue infinitely without repeating. So, Happy Pi (π) Day!