Left Right Open-Headed Arrow

Left Right Open-Headed Arrow at U+21FF is a bidirectional arrow symbol with unfilled arrowheads, used to show movement, relation, or correspondence in both left and right directions. It belongs to the Arrows block, which collects many specialized arrow forms for mathematical, technical, and diagrammatic notation. In practice, this character is uncommon compared with the ordinary left-right arrow ↔ or the double arrow ⇔. It may appear in mathematical notes, logic handouts, or technical diagrams when an author wants a visually lighter bidirectional relation without implying the stronger conventional meanings of equivalence, if and only if, or chemical resonance. It is also useful in schematic labeling, user-interface mockups, and typography samples where the open-headed style is chosen for consistency with a set of matching arrows. Because many readers and fonts favor the more familiar arrows, ⇿ is best reserved for contexts where its exact shape matters, rather than for general prose or widely shared notation.