Years ago, the infinite decimal 3.14 or its Greek symbol pi was mostly known to math and science geeks, but now March 14 is ...

Pi Day celebrates the mathematical constant π. First marked in 1988, it became an official US holiday in 2009, encouraging ...

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

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.