Discussion tab
From dKosopedia
The discussion tab is visible above the text of most mediawiki pages, between the article tab and the edit tab. Clicking on it brings up the talk page - or an option to edit that talk page if it doesn't already exist. The talk:namespace can be accessed only by discussion tabs and usually does not show up in mediawiki search. User pages also have discussion tabs, but these create user talk pages in the User_talk:namespace. Other namespaces also have such tabs by default.