square brackets

Interpolation punctuation marks

Square brackets are the punctuation marks [ and ], used in writing to enclose material inserted into a quotation or to indicate editorial additions: The witness stated, "He [the defendant] was there".

In technical contexts, square brackets denote arrays, optional elements in syntax, or mathematical operations.

British English sometimes uses them where American English uses parentheses.

Opposites
punctuation bracket type

square bracketsparentheses

Curved enclosing punctuation marks

round brackets · curly brackets · braces · angle brackets · chevrons

textual function

square bracketsoriginal text

First unedited version

verbatim · sic

Family

square, bracket, squares, squared, squaring, squarely, squareness, brackets, bracketed

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Concrete · Everyday, not technical · Rated G