square bracket

A punctuation mark, either [ or ], used to enclose additional information, editorial comments, or technical notations in written text.

• 🇷🇺Знак препинания, либо [ либо ], используемый для выделения дополнительной информации, редакторских комментариев или технических обозначений в письменном тексте.

1. Punctuation mark B2 formal

   A pair of symbols [ ] used in writing to enclose additional information, corrections, or editorial comments.

   • The editor added a note in square brackets.
   • Use square brackets to indicate a change in a quotation.
   • The instructions said to put the answer in square brackets.

   🇷🇺Квадратные скобки

2. Mathematical notation B2 formal

   Symbols used in mathematics to denote intervals, arrays, or to group expressions.

   • The interval [0, 1] includes all numbers between 0 and 1.
   • In the equation, the expression inside the square brackets is evaluated first.
   • Square brackets are used to denote matrices in linear algebra.

   🇷🇺Квадратные скобки