Category:Users

This is where you can add your page by typing [[Category:Users|XXX]] on a new line on your user page. Substitute the "XXX" with your account name, in order to get it sorted properly (otherwise it will get sorted under the letter "U").

In a Mediawiki, like this wiki, the "Special pages" in the toolbox menu on the left gives you access to the "User list" of the wiki. Actually, it seems that this list is populated by BOTs names. This is why I understand that page was created for human Users names.