A maplet or maplet arrow (symbol: ↦, commonly pronounced "maps to") is a symbol consisting of a vertical line with a rightward-facing arrow. It is used in mathematics and in computer science to denote functions (the expression x ↦ y is also called a maplet). Some examples of use of the maplet is in Z notation, a formal specification language used in software development, and separation logic, where it denotes the contents of a specific cell of memory.
- Arrow notation – e.g., , also known as map
- Mikušiak, Luboš; Miroslav Adámy; Thomas Seidmann (1997). "Publishing formal specifications in Z notation on world wide web". TAPSOFT '97: Theory and Practice of Software Development. Lecture Notes in Computer Science. Vol. 1214. pp. 871–874. doi:10.1007/BFb0030650. ISBN 978-3-540-62781-4.
- Unicode Character 'RIGHTWARDS ARROW FROM BAR' (U+21A6)