This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as leftward tab.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+21E4 forms with similar adjacent characters prevents a line break inside it.
The CLDR project calls this character “leftwards arrow bar” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: arrow, bar, leftwards.
The Wikipedia has the following information about this codepoint:
The tab keyTab ↹ (abbreviation of tabulator key or tabular key) on a keyboard is used to advance the cursor to the next tab stop.
Representations
System
Representation (click value to copy)
Nº
8676
UTF-8
E2 87 A4
UTF-16
21 E4
UTF-32
00 00 21 E4
URL-Quoted
%E2%87%A4
HTML hex reference
⇤
Wrong windows-1252 Mojibake
⇤
HTML named entity
⇤
HTML named entity
⇤
alias
leftward tab
Encoding: GB18030 (hex bytes)
81 36 CE 38
Adobe Glyph List
arrowtableft
RFC 5137
\u'21E4'
Bash and Zsh inside echo -e
\u21E4
C and C++
\u21E4
C#
\u21E4
CSS
\0021E4
Excel
=UNICHAR(8676)
Go
\u21E4
JavaScript
\u21E4
Modern JavaScript since ES6
\u{21e4}
JSON
\u21E4
Java
\u21E4
Lua
\u{21E4}
Matlab
char(8676)
Perl
"\x{21E4}"
PHP
\u{21e4}
PostgreSQL
U&'\21E4'
PowerShell
`u{21E4}
Python
\u21E4
Ruby
\u{21e4}
Rust
\u{21e4}
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