The Complete Guide to the ⇆ (Left Arrow Over Right Arrow) Symbol
The ⇆ symbol, officially named the Leftwards Arrow Over Rightwards Arrow, represents a bidirectional exchange, swap, or reversible process. In digital interfaces, it frequently indicates data synchronization, account switching, or translating between two languages. You will often spot this symbol in chemistry to denote a reversible reaction, or in casual text messages to show a back-and-forth exchange of ideas.
Introduced in Unicode version 1.1 back in 1993, this character lives in the Arrows block under the code point U+21C6. As a standard text character rather than a colorful emoji, its appearance changes slightly depending on the operating system, browser, and font you use. Despite these minor stylistic variations, its core design remains universal: a top arrow pointing left stacked directly above a bottom arrow pointing right.
Beyond basic user interface design, the ⇆ symbol serves multiple distinct roles across different fields. In mathematics and formal logic, it represents an interchange or a two-way mapping between sets. In the sciences, chemists use it to illustrate reversible reactions, though it carries a slightly different nuance than standard equilibrium markers. On social media and messaging apps, internet users type the symbol to represent swapping items, changing their minds, or illustrating a back-and-forth conversation. Programmers also utilize the character in software documentation to indicate a data swap, network ping, or two-way sync between servers.
Typing the ⇆ symbol takes a quick shortcut since it does not appear on standard keyboards. On a Mac, you can press Control + Command + Space to open the Character Viewer and search for "Leftwards Arrow Over Rightwards Arrow". On a Windows PC, hold the Alt key and type 8646 on the numeric keypad. For web developers, the HTML entity ⇆ or the hex code ⇆ will seamlessly render the symbol on any webpage. Of course, copying and pasting the character directly from a reference site like EmojiAtlas is always a reliable fallback.
It is easy to mix up ⇆ with its close Unicode relatives. The most obvious counterpart is ⇄ (Rightwards Arrow Over Leftwards Arrow), which simply flips the vertical order of the two arrows. You might also encounter the standard Left-Right Arrow (↔), which merges the two directions into a single line to show a direct connection, distance, or physical resizing. Finally, the Rightwards Harpoon Over Leftwards Harpoon (⇌) is the go-to choice for chemists dealing specifically with chemical equilibrium.