U+21DA "⇚" Leftwards Triple Arrow Unicode Character

U+21DA "⇚" Leftwards Triple Arrow is a typographic symbol used in mathematics, computer science, and formal logic to denote a specific kind of backward or reverse mapping, often representing a leftward tripling or a threefold iteration of a process directed to the left. It stands in contrast to its rightward counterpart, U+21DB "⇛", and is frequently employed to indicate rewinding, reversing a triple step, or a bidirectional relationship involving three parallel arrows in diagrams and technical notation. While less common in everyday text, this arrow adds precision in contexts like chemical equations, state transitions, or abstract rewriting systems.