Definition of square bracket in US English:

square bracket

noun

British
  • another term for bracket (sense 1 of the noun)
    • ‘I have corrected a couple of typos and added a few comments of my own in square brackets and italics.’
    • ‘As in many printed editions, editorial intervention is signalled by square brackets.’
    • ‘I have added my own explanatory notes in the square brackets.’
    • ‘An extra key brings up a list of characters that you won't find on the keyboard, such as the forward slash, square brackets and curly braces.’
    • ‘This sentence was spoken in the interview, but without the words around which I've put square brackets.’

Pronunciation

square bracket

/skwe(ə)r ˈbrakət//skwɛ(ə)r ˈbrækət/