Section sign.
More from Punctuation.
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+00A7 (decimal 167).
Use § in HTML to render § on a web page.
On Windows you can type it with Alt+167 (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.