The symbol of multiplication is ∏, which is the capital pronunciation of the Greek letter π pai. In mathematics, it usually means continuous multiplication and lowercase π means pi, just as σ means continuous addition.

"∏" stands for "quadrature", and the initial value and final value of quadrature are added up and down. For example, "i= 1" can be written below the symbol, and "n" can be written above the symbol, which means that I in the following quadrature formula is added to n from 1.

∏ other meaning:

Lowercase indicates that pi is 3. 14 159265.

In addition, π(x) represents the number of prime numbers of positive integers in x.

For example, π(20)=7, that is, there are 7 prime numbers within 20.

How to pronounce п:

п is an uppercase Cyrillic letter, and lowercase is п.

Usually called Pe, it is called Pu in Bulgarian.

The Latin letter P and the Cyrillic letter п both evolved from the Greek letter п.