Product

Product[f, {i, imin, imax}] evaluates the product of f as i ranges from imin to imax.

Examples

Factorial as a product:

Product[i, {i, 1, 5}]
(* 120 *)

Symbolic product:

Product[x + i, {i, 0, 3}]
(* x (1 + x) (2 + x) (3 + x) *)

Please visit the official Wolfram Language Reference for more details.