Which character is needed between a URL address and the port number in a browser to allow you to connect to that port specifically, vs default port 80?

Which character is needed between a URL address and the port number in a browser to allow you to connect to that port specifically, vs default port 80?

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EXPLANATION

The Hypertext Transfer Protocol (HTTP) is an application layer protocol that is used to transmit virtually all files and other data on the World Wide Web, whether they're HTML files, image files, query results, or anything else. Usually, HTTP takes place through TCP/IP sockets.
A browser is an HTTP client because it sends requests to an HTTP server (Web server), which then sends responses back to the client. The standard (and default) port for HTTP servers to listen on is 80, though they can use any port.
HTTP is based on the TCP/IP protocols, and is used commonly on the Internet for transmitting web-pages from servers to browsers.