how to express multiplication of n numbers

[doty]

hello, everyone. Given n numbers a_i (i=1...n), how to exactly express multiplication of n numbers?
which one of the following expressions is best? Or you have any other suggestions?
"multiplication of a_is"
"multiplication of a_i"
"series multiplication of a_is"
"series multiplication of a_i"

 

[Offroad]

The product of the elements of vector a is n!.
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[Raymott]

The product of the elements of vector a is n!.
​

Yes, called 'factorial n'.
Does 'a_i' mean "series a with integer elements i"?
If so, factorial a_i (i=1...n) means factorial n.

 

[doty]

a_i stands for a series of numbers with subscript i, and i runs from 1 to n. a_i is not i itself.

 

[Offroad]

a_i stands for a series of numbers with subscript i, and i runs from 1 to n. a_i is not i itself.

The product of the elements of vector a is p, p = a(1)*a(2)*...*a(n-1)*a.