Pi may refer to any of the following:
1. Pi or p is a value equal to "3.14159265358979323846264..." that is the ratio of the circumference to the diameter of a circle and represented by a symbol like that shown in the picture. To insert the Pi symbol in a web page, use the π extended HTML code.
Tip: The unofficial Pi day is celebrated March 14th of every year, which is 3/14 or the first three digits of Pi.
Tip: In Windows to create this mark open the character map tool and select and copy the mark to be inserted into any document or picture.
2. Pi is also the symbol for a Pebi.