Rightwards Arrow Over Leftwards Arrow Symbol

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

Arrow Symbols collection

Symbol: ⇄
Unicode: U+21C4
HTML entity: ⇄
Category: Arrow Symbols

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42 of 84 in the arrow symbols collection

About the rightwards arrow over leftwards arrow symbol

In chemistry, this paired arrow appears in reaction equations to mark a reversible process where reactants form products and products can revert to reactants. It represents a dynamic equilibrium, distinct from the single-headed arrows used for one-way reactions.

As a symbol in the Arrows block, this character combines two horizontal arrowheads pointing in opposite directions, one above the other. It is sometimes used in diagrams or notation to indicate bidirectional movement or exchange between two states.

How to type Rightwards Arrow Over Leftwards Arrow

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 21C4 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 21C4.
Or: Control + Command + Space opens the Character Viewer — search by name.