<P> The symbol used by mathematicians to represent the ratio of a circle 's circumference to its diameter is the lowercase Greek letter π , sometimes spelled out as pi , and derived from the first letter of the Greek word perimetros , meaning circumference . In English , π is pronounced as `` pie '' ( / paɪ / , paɪ ) . In mathematical use , the lowercase letter π ( or π in sans - serif font ) is distinguished from its capitalized and enlarged counterpart ∏ , which denotes a product of a sequence , analogous to how ∑ denotes summation . </P>
<P> The symbol used by mathematicians to represent the ratio of a circle 's circumference to its diameter is the lowercase Greek letter π , sometimes spelled out as pi , and derived from the first letter of the Greek word perimetros , meaning circumference . In English , π is pronounced as `` pie '' ( / paɪ / , paɪ ) . In mathematical use , the lowercase letter π ( or π in sans - serif font ) is distinguished from its capitalized and enlarged counterpart ∏ , which denotes a product of a sequence , analogous to how ∑ denotes summation . </P>
where did the math symbol pi come from
where did the math symbol pi come from
the lowercase Greek letter π
the lowercase Greek letter π