Leftwards Triple Arrow

Leftwards Triple Arrow at U+21DA is a left-pointing arrow made with three parallel strokes, used to show a strong or emphasized direction toward the left. It is in the Arrows block, among symbolic arrows for diagrams, logic, mathematics, and technical notation rather than ordinary punctuation. Its most practical use is in typeset mathematics, formal logic, and theoretical computer science when an author needs a leftward implication-like or mapping-like arrow distinct from the standard single and double arrows. For example, a paper may define a special relation with ⇚ to mean “is derived from,” “is forced by,” or “receives information from,” but the exact meaning is normally established by that document’s notation. It also appears in diagrams, UI mockups, and plain-text labels where a very strong backward, return, or reverse direction is wanted, especially when simpler arrows are already being used for other levels of movement. Because the triple stroke is not a widely standardized operator in most fields, readers should not assume a universal meaning without local context.