Quick definitions from WordNet (bracket)

▸ noun:  an L-shaped support projecting from a wall (as to hold a shelf)
▸ noun:  either of two punctuation marks ([ or ]) used to enclose textual material
▸ noun:  a category falling within certain defined limits
▸ noun:  either of two punctuation marks (`<' or `>') sometimes used to enclose textual material
▸ verb:  classify or group
▸ verb:  place into brackets ("Please bracket this remark")
▸ verb:  support with brackets ("Bracket bookshelves")
▸ name:  A surname (very rare: popularity rank in the U.S.: #65408)

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▸ Also see bracket