Leftwards Double Arrow ⇐

The Leftwards Double Arrow character (⇐) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference ⇐, the decimal numeric character reference ⇐, or the hexadecimal numeric reference ⇐. The character is assigned Unicode code point U+21D0 in the Universal Character Set.

The leftwards double arrow features two parallel arrow lines pointing left. In mathematics and logic, double arrows carry stronger meaning than single arrows — the leftwards double arrow typically represents the reverse implication 'is implied by.' The double strokes distinguish logical operators from simple directional indicators.

Arrow entities serve as directional indicators in navigation interfaces, mathematical expressions, flowcharts, and textual content throughout the web. Because they render as scalable text characters rather than bitmap images, HTML arrow entities are resolution-independent, styleable with CSS properties like color and font-size, and fully accessible to assistive technologies including screen readers.

When deciding how to encode the Leftwards Double Arrow character in your HTML documents, the named entity ⇐ is generally the most readable choice for developers reviewing or maintaining source code. The decimal form ⇐ and hexadecimal form ⇐ are equally valid alternatives that work in contexts where named entities may not be supported, or when generating HTML output programmatically from server-side code. All three representations produce identical visual output in every modern web browser.

Use the leftwards double arrow in logical expressions for reverse implication (B ⇐ A means 'A implies B'), in academic papers, and in technical documentation where you need a visually heavier arrow than the single-line variant. In UI contexts, it can emphasize a return or undo action.