Mathematical Left White Square Bracket Symbol

A symbol from the Bracket Symbols collection. Click the symbol or the button below to copy.

Symbol: ⟦
Unicode: U+27E6
HTML entity: ⟦
Category: Bracket Symbols

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11 of 56 in the bracket symbols collection

About the mathematical left white square bracket symbol

Part of the Miscellaneous Mathematical Symbols A block, this character is an open punctuation mark used in mathematical notation to denote the beginning of an interval or a grouping, distinguished by its white, or hollow, appearance. It pairs with a corresponding closing bracket to enclose expressions, often in formal logic or set theory, where the visual contrast from a standard square bracket helps avoid ambiguity.

Outside of specialized mathematics, it occasionally appears in technical or academic writing where clear visual separation of nested brackets is needed. Its use is limited to contexts requiring precise symbolic notation, not general prose.

How to type Mathematical Left White Square Bracket

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 27E6 then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 27E6.
Or: Control + Command + Space opens the Character Viewer — search by name.