Usage: add and subtract to find the initial value and final value of the product. For example, you can write "i= 1" under the symbol and "n" above the symbol, which means that I in the following quadrature formula is added to n from 1. That is, (1+d1/p1) (1+d2/p2) ... (1+dn/pn).

∏ is the Greek letter, that is, the capital form of π, which mathematically means quadrature operation or direct product operation, and is similar to σ in form.

Commonly used mathematical symbols:

1、∫?

Indefinite integral.

2、∮

Closed surface integral.

3、 ∝?

Infinitely small.

4、∞?

Infinite.

5、∨?

A collection of symbols.

6、∧?

Symbol collection, payment.

7、∑?

Sum symbol, continuous addition.

8、∏?

Orthogonal symbols, multiplication.

9、∪

Logical symbols and.

10、 ≌?

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