π
パ
イ
Meanings
1
Refers to the Greek letter π itself, used in various contexts such as mathematics, science, and fraternity names.
The Greek letter π is read as 'pi'.
2
Only when written π
The mathematical constant approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter.
The circular constant pi is approximately 3.14.
3
Only when written Π
Uppercase Π used in mathematics to denote the product of a sequence, analogous to Σ for summation.
Π is a symbol representing the product of a sequence.