Left Right Arrow

The Left Right Arrow at U+2194 marks a two-way direction, relationship, or connection between things. It is part of the Arrows block and functions as a printable symbol rather than a letter or punctuation mark. In mathematics and logic, it commonly expresses equivalence or a bidirectional implication, as in P ↔ Q meaning that P is true exactly when Q is true. In general diagrams and technical writing, it indicates movement or correspondence in both directions, such as a reversible process, a two-way street, a resize handle, or a mapping between two labels. In user interfaces and plain-text notes, it is often used where space is tight to mean “left and right,” “back and forth,” or “between,” for example New York ↔ London for travel between two places. It can resemble related arrows used for longer mathematical arrows or specialized equivalence signs, so formal publications may choose a more specific symbol when the distinction matters.