Slang meaning of square brackets

square brackets means: n brackets. Something went very wrong at some point in history. Nobody knows what it was, but the end result of it was that, to Brits, [these] are square brackets, and (these) are “brackets”. To Americans, [these] are “brackets” and (these) are “parentheses”. Even {these} ended up being “braces” to Americans but “curly braces” to Brits. It’s possible many people have died as a result of these confusions, although I can’t exactly work out how.