Currently, the main namespace is called "Articles" on whichever wiki AdvancedSearch is being used.
The normally used labels are different though, e.g. (Articles) on Wikipedia or (Main) on mediawiki.
- The main namespace is called the same on AdvancedSearch as in the old namespace selection box.
This is done using the message 'blanknamespace' from mediawiki core, like on Special:RecentChanges