Maps to

{{Short description|Mathematical symbol to denote a function}}

{{For|the butterfly called a maplet|Chersonesia{{!}}Chersonesia}}

{{Infobox punctuation mark|mark=↦}}

The maps to symbol, ↦, is a rightward arrow protruding from a vertical bar. It is used in mathematics and in computer science to denote functions. In Z notation, a specification language used in software development,{{cite book|last=Mikušiak|first=Luboš |author2=Miroslav Adámy |author3=Thomas Seidmann |title=TAPSOFT '97: Theory and Practice of Software Development |chapter=Publishing formal specifications in Z notation on world wide web |series=Lecture Notes in Computer Science |year=1997|volume=1214 |pages=871–874|doi=10.1007/BFb0030650|isbn=978-3-540-62781-4 |doi-access=free}} this symbol is called the maplet arrow and the expression x ↦ y is called a maplet. In separation logic it denotes the contents of a specific cell of memory.

In the Unicode character set, the symbol is code point U+21A6.[https://www.fileformat.info/info/unicode/char/21a6/index.htm Unicode Character 'RIGHTWARDS ARROW FROM BAR' (U+21A6)]