Mathematical Left Double Angle Bracket Symbol

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

Symbol: ⟪
Unicode: U+27EA
HTML entity: ⟪
Category: Bracket Symbols

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21 of 56 in the bracket symbols collection

About the mathematical left double angle bracket symbol

In mathematical typesetting, the double left angle bracket marks the beginning of a doubled angle-bracket pair, often used to denote a sequence or an inner product in higher-level algebra or functional analysis. It is the opening member of a paired delimiter, visually extending the single-angle bracket to indicate a nested or more complex bracketing structure.

This character belongs to the block of symbols reserved for specialized mathematical notation and is classified as an opening punctuation mark. As a non-emoji, it appears only in formal mathematical documents, not in casual or decorative text.

How to type Mathematical Left Double Angle 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 27EA 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 27EA.
Or: Control + Command + Space opens the Character Viewer — search by name.