The capital Greek letter (capital Pi) is used in math to represent the product operator. Typically, the product operator is used in an expression like this:
In plain language, this means take the product of the sequence of expressions represented by the expression starting from and iterating until .
Symbol  Format  Data 

Π  Unicode 

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The product operator is represented by the Π (capital pi) symbol and is used to represent the operation of multiplying a sequence of expressions together.
The Greek letter π (pi) is used in trigonometry as a constant to represent a halfrotation around a circle in radians. The value of π is approximately 3.14 and appears in the geometric formulas for finding the circumference and area of the circle. The value of π can be calculated by dividing any circle's circumference by its diameter.