U+21BD "↽" Leftwards Harpoon with Barb Downwards Unicode Character

U+21BD "↽" Leftwards Harpoon with Barb Downwards is a typographic symbol from the Arrows block, specifically classified as a mathematical arrow that visually depicts a horizontal line pointing to the left with a small downward hook or barb at its tip. It is most commonly used in mathematical and scientific notation, particularly in fields like linear algebra and physics, to represent a mapping, a function, or a directed relation where the leftward direction is emphasized with a downward vertical component. This glyph also appears in technical diagrams and logic circuits to denote a unidirectional flow or a specific type of dependency, distinguishing it from simpler leftward arrows by the addition of the barb which clarifies the intended orientation of the vector or operation.