What are the strings in Curly brackets {...}?

l10n
#1

Those brackets are used to enclose certain material;
            [well, in the non-computer world at least :wink: ]

       Forinstance if there's a group of whatever which belong together,
use { or } or {} ;
           where if there's some word(s) to be set apart from the rest of
the group/paragragh, use [] ;

       Therefore, one might find some set enclosed with []
          and then find multiple sets enclosed as [ [ ... ] [ ... ] [ ... ]
]