Upwards Double Arrow ⇑

The Upwards 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+21D1 in the Universal Character Set.

The upwards double arrow features two parallel arrow lines pointing up. It provides a visually stronger upward indicator than the single arrow. In mathematical contexts, it can represent strong increase or convergence. In UI design, it emphasizes upward actions.

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 Upwards 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 upwards double arrow for emphasis in upward indicators, mathematical notation requiring a strong upward symbol, and UI elements where a bold directional indicator is needed. It pairs with ⇓ for vertical double-arrow pairs.