Parentheses, brackets and braces
In American English, ( ) are parentheses, [ ] are brackets or square brackets, { } are braces or curly brackets, and ⟨ ⟩ are angle brackets. British English calls ( ) round brackets, or simply brackets.
Parentheses hold asides and abbreviations. Square brackets mark words added to a quotation, such as "she [the manager] agreed", or flag an error in the original with [sic]. Curly braces group code blocks and list the members of a set in math, as in {1, 2, 3}.
Lenticular 【 】 and corner 「 」 brackets
The thick lenticular brackets 【 】 come from Chinese and Japanese typography, where they highlight headings, labels and key terms. Corner brackets 「 」 are Japanese quotation marks, and white corner brackets 『 』 mark a quote inside a quote or the title of a book. Double angle brackets 《 》 enclose book titles in Chinese.
Outside Asia these brackets have become a style tool. Gamers frame clan tags and names (【KNIGHT】), video titles use labels like 【Official Video】, and aesthetic bios wrap a word or emoji in ꒰ ꒱ or 『 』. They are plain text, so they paste into Discord, Instagram and most game name fields that accept Unicode. Fill the frame with styled letters from the fancy text generator.
Math brackets and how to type brackets
Mathematicians use ⟨ ⟩ for inner products and averages, ⌈ ⌉ and ⌊ ⌋ for the ceiling and floor functions, and ⟦ ⟧ in computer science semantics. Use the math angle brackets ⟨ ⟩ rather than the less-than and greater-than signs < >, which have different shapes and spacing.
On a US keyboard, parentheses are Shift + 9 and Shift + 0, square brackets have their own keys to the right of P, and braces are the same keys with Shift. Lenticular and corner brackets have no standard shortcut outside a Japanese or Chinese keyboard, so copy them here. For quote marks, see quotation mark symbols; for frames and boxes, see border symbols.