backslash / slash
The two slanted marks.
A slash is this mark: /. A backslash is this mark: \. Paths on the web use slashes. Windows paths use backslashes. Do not call a slash a backslash.
Examples
Use The address uses a slash: https://usagedictionary.com.
Use The folder path uses a backslash.
Avoid Type a backslash between http and the site name.