Several national retailers are offering Pi Day discounts and special deals on March 14 to celebrate the mathematical holiday.

Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — ...

Pi belongs to a huge mathematical group called irrational numbers, which go on forever and cannot be written as fractions.

Math fanatics from all around the world and everyone else who just loves ancient Greek pi (or pie) celebrate on March 14.