What does "AA guns" here (osm.org/node/4472711501) mean?

What does "AA gun" mean?

What does "Abandoned AA sites" mean? Perhaps "Abandoned Artillery Ammunition sites"?
In any case this seems to be rather a description than a name.

I did not mark any hall as a tourism attraction, as you can see in the history. This was done by other users more than four years ago. So please feel free to change or contact the appropriate user. I certainly agree that (if any) only the centre itself should be tagged as tourism=attraction.
If you know a better tag for an auditorium than amenity=theatre and theatre:genre=philharmonic/chamber_music/etc., than please feel free to change. I refer to the discussion osm.wiki/Tag:amenity%3Dconcert_hall

changed to bridge=yes

yes; changed to bridge=yes

changed to bridge=yes

Thank you for the note; all tags track=* on Falkland Islands removed.