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The Unicode character U+21D4, officially named LEFT RIGHT DOUBLE ARROW, was introduced in Unicode version 1.1. It is part of the Arrows block, which belongs to the Basic Multilingual plane.
Categorized technically as a Math Symbol, this character typically falls under the Common script. In terms of text layout and rendering, the glyph is not a composition and has ambiguous in East Asian typography. When placed in bidirectional text, it behaves as an Other Neutral character. Its visual representation remains not mirrored regardless of the reading direction.
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| Nº |
8660
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|---|---|
| UTF-8 |
E2 87 94
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| UTF-16 |
21 D4
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| UTF-32 |
00 00 21 D4
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| URL-Quoted |
%E2%87%94
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| HTML hex reference |
⇔
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| RFC 5137 |
\u'21D4'
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| Bash and Zsh (inside echo -e) |
\u21D4
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| C and C++ |
\u21d4
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| C# |
\u21d4
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| CSS |
\0021D4
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| Excel |
=UNICHAR(8660)
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| Go |
\u21d4
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| JavaScript |
\u21D4
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| Modern JavaScript (since ES6) |
\u{21d4}
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| JSON |
\u21D4
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| Java |
\u21D4
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| Lua |
\u{21D4}
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| Matlab |
char(8660)
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| Perl |
\x{21D4}
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| PHP |
\u{21d4}
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| PostgreSQL |
U&'\21D4'
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| PowerShell |
`u{21D4}
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| Python |
\u21d4
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| Ruby |
\u{21d4}
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| Rust |
\u{21d4}
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