Π
Symbol  Format  Data 

Π  Code Point 
U+03A0 
TeX 
\Pi 

SVG 
The capital Greek letter (capital pi) is visually very similar to the product symbol (∏) which is the dedicated symbol in math for the product operation.
In math, the product symbol (∏) is used to denote the product operation, which is a way of expressing the multiplication of a sequence of factors.
The greek small letter π (pi) is a geometric constant approximately equal to 3.1416. The numeric value is equal to the length of any circle's circumference divided by its diameter.