I saw a site - they wanted to link, it had Redirected=Y at the end of the URL, I have not seen this before and wondered what it meant.
It's a query string or part of it, usually used for server processing but can also be made use of within the client-side script as well.
We can never know for sure what it is used at the server-side, you can try removing that text string and see if the page rendered differently.
A page can be using
page?helloworld=yes&goodbyeworld=no which doesn't make sense to users. It can actually be doing tons of server-side logging/processing/data-ming etc. Or it can simple just be a joke. :)
Did it follow a ? or & character? It's probably a query string used by the server hosting the site. You can get and set querystrings easily so it could mean anything but it's probably just some mechanism to tell the server that the visitor was redirected. Maybe it's so that they can tell who followed the link directly as oppsed to finding the site via a search engine or something like that?
This is called a query string parameter. Essentially, it's a method to make variables available to their server-side scripting language from the requested URL. In this example the variable name is 'Redirected' and the value is 'Y'. The parameters follow a '?' and multiple parameters can be separated with an '&'. For example ( http://example.com?foo=bar&omg=lol )