U+21FB "⇻" Rightwards Arrow with Double Vertical Stroke Unicode Character

U+21FB "⇻" Rightwards Arrow with Double Vertical Stroke is a symbol in the Arrows block, typically used in mathematical notation or technical diagrams to indicate a specific type of mapping, transformation, or directional flow that is distinguished by the two vertical lines intersecting the arrow's shaft. This double vertical stroke often denotes a strict or forceful execution, such as in process flowcharts, circuit schematics, or theoretical computing contexts where it may represent a map or operation with added constraints. Its design visually sets it apart from a standard rightward arrow, signaling a precise or specialized function to the reader.