The N-Ary Product symbol (∏). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Math.
The quickest way is to copy ∏ from this page and paste it anywhere. You can also insert it with its Unicode, HTML, or alt code listed above.
∏ is U+220F (decimal 8719).
Use ∏ in HTML to render ∏ on a web page.
On Windows you can type it with Alt+8719 (hold Alt and enter the number on the numeric keypad).
Yes — copying is completely free and unlimited, and works right in your browser with no sign-up.