U+21A4 "↤" Leftwards Arrow from Bar Unicode Character
Unicode Version 17.0
↤
U+21A4 "↤" Leftwards Arrow from Bar is a typographic symbol in the Arrows block, depicting an arrow pointing to the left with a vertical bar at its origin instead of a standard arrow tail. It is often used in mathematics, logic, and computer science to denote a mapping, assignment, or function declaration, particularly in contexts like the "maps to" notation where it represents a relation from a domain to a codomain, such as in the expression x ↤ f(x). Its design conveys a clear directional association while the bar emphasizes a point of departure or initial state.
General Properties
| Code Point | U+21A4 |
| Version Added | 1.1 |
| Name | Leftwards Arrow from Bar |
| Unicode 1.0 Name | Left Arrow from Bar |
| Block | Arrows |
| General Category | Other Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
Encodings
| HTML Decimal Encoding | ↤ |
| HTML Hex Encoding | ↤ |
| UTF-8 Encoding | 0xE2 0x86 0xA4 |
| UTF-16 Encoding | 0x21A4 |
| UTF-32 Encoding | 0x000021A4 |
| C/C++/Java Escape | \u21a4 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Pattern Syntax | Yes |
| Math | Yes |
| Other Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |