There are two uses of square brackets (which, confusingly, Americans call simply brackets):
- to set off an interruption within a direct quotation [Churchill said of the Battle of Britain: “Never in the field of human conflict was so much owed by so many to so few [the Royal Air Force pilots]”.]
- to set off material which is extraneous to the main text, such as the examples of the usage of punctuation in this essay or comments in a draft document which are not intended to be in the final version
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