When allocating
arrows, the Unicode committee didn't leave enough
expansion space for
future arrows. Thus two new code blocks,
Supplemental Arrows A and
Supplemental Arrows B, were added for version 3.2. They are part of the Unicode 3.2 effort to offer complete suppport for
ISO TR 9573-13.
The long arrows encoded in the range U+27F5 to U+27FF map to standard SGML entity sets supported by MathML. Long arrows represent distinct semantics from their short counterparts, rather than mere stylistic glyph differences. For example, the shorter forms of arrows are often used in connection with limits, whereas the longer ones are associated with mappings. The use of the long arrows is so common that they were assigned entity names in the ISOAMSA entity set, one of the suite of mathematical symbol entity sets covered by the Unicode Standard.
See also the code blocks Arrows and Supplemental Arrows B.
Unicode's
Supplemental Arrows A code block reserves the
16 code points from U+27F0 to U+27FF, of which all 16 are currently assigned.
Miscellaneous Mathematical Symbols A <-- Supplemental Arrows A --> Braille Patterns
All the characters in this code block were added in Unicode 3.2
All the characters in this code block are in general category Symbol, Math Sm
All the characters in this code block are in bidirectional category Other Neutral ON
The columns below should be interpreted as :
- The Unicode code for the character
- The character in question
- The Unicode name for the character
If the characters below show up poorly, or not at all, see Unicode Support for possible solutions.
Supplemental Arrows A
Arrows
- U+27F0 ⟰ upwards quadruple arrow
- ref U+290A ⤊ upwards triple arrow (Supplemental Arrows B)
- ref U+2B45 ⭅ leftwards quadruple arrow (Miscellaneous Symbols and Arrows)
- U+27F1 ⟱ downwards quadruple arrow
- ref U+290B ⤋ downwards triple arrow (Supplemental Arrows B)
- U+27F2 ⟲ anticlockwise gapped circle arrow
- ref U+21BA ↺ anticlockwise open circle arrow (Arrows)
- ref U+2940 ⥀ anticlockwise closed circle arrow (Supplemental Arrows B)
- U+27F3 ⟳ clockwise gapped circle arrow
- ref U+21BB ↻ clockwise open circle arrow (Arrows)
- ref U+2941 ⥁ clockwise closed circle arrow (Supplemental Arrows B)
- U+27F4 ⟴ right arrow with circled plus
- ref U+2B32 ⬲ left arrow with circled plus (Miscellaneous Symbols and Arrows)
Long arrows
The long arrows are used for mapping whereas the short forms would be used in limits. They are also needed for MathML to complete mapping to the AMSA sets.
- U+27F5 ⟵ long leftwards arrow
- sgml ⟵ ⟵ ⟵
- ref U+2190 ← leftwards arrow (Arrows)
- U+27F6 ⟶ long rightwards arrow
- sgml ⟶ ⟶ ⟶
- ref U+2192 → rightwards arrow (Arrows)
- U+27F7 ⟷ long left right arrow
- sgml ⟷ ⟷ ⟷
- ref U+2194 ↔ left right arrow (Arrows)
- U+27F8 ⟸ long leftwards double arrow
- sgml ⟸ ⟸ ⟸
- ref U+21D0 ⇐ leftwards double arrow (Arrows)
- U+27F9 ⟹ long rightwards double arrow
- sgml ⟹ ⟹ ⟹
- ref U+21D2 ⇒ rightwards double arrow (Arrows)
- U+27FA ⟺ long left right double arrow
- sgml ⟺ ⟺ ⟺
- ref U+21D4 ⇔ left right double arrow (Arrows)
- U+27FB ⟻ long leftwards arrow from bar
- aka maps from
- ref U+21A4 ↤ leftwards arrow from bar (Arrows)
- U+27FC ⟼ long rightwards arrow from bar
- sgml ⟼ ⟼
- aka maps to
- ref U+21A6 ↦ rightwards arrow from bar (Arrows)
- U+27FD ⟽ long leftwards double arrow from bar
- ref U+2906 ⤆ leftwards double arrow from bar (Supplemental Arrows B)
- U+27FE ⟾ long rightwards double arrow from bar
- ref U+2907 ⤇ rightwards double arrow from bar (Supplemental Arrows B)
- U+27FF ⟿ long rightwards squiggle arrow
- sgml ⟿
- ref U+21DD ⇝ rightwards squiggle arrow (Arrows)
- ref U+2B33 ⬳ long leftwards squiggle arrow (Miscellaneous Symbols and Arrows)
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