noun
Refers to the Greek letter π itself, used in various contexts such as mathematics, science, and fraternity names.
ギリシャ文字のπは「パイ」と読む。
The Greek letter π is read as 'pi'.
noun
Only when written π
The mathematical constant approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter.
円周率πは約3.14です。
The circular constant pi is approximately 3.14.
noun
Only when written Π
Uppercase Π used in mathematics to denote the product of a sequence, analogous to Σ for summation.
Πは数列の積を表す記号です。
Π is a symbol representing the product of a sequence.