The URL column in the main request grid for Chrome and Edge displays indicator icons to show information about the type of the request. The indicator icons can be switched off in Tools->Options->URL Display

The following symbols may be displayed next to a URL:

Red warning triangle (⚠)

This highlights that the request uses insecure HTTP and should be changed to the secure HTTPS scheme preferred by modern browsers:

Right arrow (➔)

The request was created in JavaScript using the XmlHttpRequest (XHR) API:

Arrow head (➤)

The request was created in Javascript using the Fetch API:

Diamond (◆)

This symbol shows that the request was initiated by a service worker: