U+2951 "⥑" Up Barb Left down Barb Left Harpoon Unicode Character

U+2951 "⥑" Up Barb Left down Barb Left Harpoon is a typographic symbol used in mathematical notation, specifically within the field of set theory and logical mappings to represent a bidirectional harpoon with barbs pointing upward and downward on the left side of a horizontal line, signifying a relation or a two-way directional dependency that originates from or interacts with an element on the left. It belongs to the "Supplemental Arrows-B" block of Unicode and is often employed in diagrams for category theory or complex relational algebra, where precise directional indicators are essential for illustrating correspondences between objects or variables without the confusion of standard arrows.