Rightwards Double Arrow ⇒

The Rightwards 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+21D2 in the Universal Character Set.

The rightwards double arrow is the standard symbol for logical implication in mathematical logic, read as 'implies.' It features two parallel arrow lines pointing right. In formal writing, it is strictly distinguished from the single arrow, which often represents function mapping rather than logical implication.

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 Rightwards 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 rightwards double arrow for logical implication (A ⇒ B) in formal logic, mathematical proofs, and computer science documentation. It is the proper symbol for 'if A then B' in formal notation and should not be confused with the single rightwards arrow used for function types.