Horizontal Line Extension Symbol

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

Symbol: ⎯
Unicode: U+23AF
HTML entity: ⎯
Category: Line Symbols

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Download Horizontal Line Extension as SVG or PNG — or add a caption to make a labelled icon, badge or sticker.

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transparent background

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4 of 62 in the line symbols collection

About the horizontal line extension symbol

The Horizontal Line Extension is a simple, straight horizontal bar used in mathematical and technical notation. It has the same width and weight as a standard em dash but serves a different purpose, often appearing as a connector or continuation mark in diagrams, brackets, or other symbolic structures within the Miscellaneous Technical block. Unlike a hyphen or dash, it is specifically designed to extend or link parts of a mathematical expression or technical drawing.

How to type Horizontal Line Extension

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 23AF 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 23AF.
Or: Control + Command + Space opens the Character Viewer — search by name.