Brackets (AmE)/Square brackets (BrE) — [ ]

(for Brackets (BrE), see Parentheses)

a.     Brackets/square brackets enclose editorial insertions, corrections, explanations, or comments.

e.g. She [Ayako Miura] died in 1999, after a remarkable career.

b.     Brackets/square brackets may also enclose the phonetic transcript of a word.

e.g. He attributed the light to the phenomenon called gegenschein [ga-gen-shin].