The Greek letter π is the symbol for the irrational number representing the ratio of the circumference of a circle to its diameter. It is approximately 3.1415926. Pi Day is an annual celebration on March 14th (3/14), with this year’s being a very special Pi Day (3/14/15).
Through the NIH Library’s Technology Sandbox, a 2014 trial of 3D printers exposed NIH staff to cutting edge technology for work and research. The pilot was so successful that the Library is now permanently offering free 3D printing services.