Represents the mathematical constant as used in the software
PI is a mathematical constant which is defined as the ratio of a circles circumference to its diameter.
The value of PI used in the software is 3.141592.
The area of a circle with the radius of 50 can be defined in the software as follows
=PI*(50^2)
The circumference of a circle with a diameter defined as a variable @DIAMETER@ could be shown as
=@DIAMETER@*PI