This character is a Math Symbol and is commonly used, that is, in no specific script.
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+21F6 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
An arrow is a graphical symbol, such as ← or →, or a pictogram, used to point or indicate direction. In its simplest form, an arrow is a triangle, chevron, or concave kite, usually
affixed to a line segment or rectangle, and in more complex forms a representation of an actual arrow (e.g. ➵ U+27B5). The direction indicated by an arrow is the one along the length of the line or rectangle toward the single pointed end.
Representations
System
Representation (click value to copy)
Nº
8694
UTF-8
E2 87 B6
UTF-16
21 F6
UTF-32
00 00 21 F6
URL-Quoted
%E2%87%B6
HTML hex reference
⇶
Wrong windows-1252 Mojibake
⇶
Encoding: GB18030 (hex bytes)
81 36 D0 36
RFC 5137
\u'21F6'
Bash and Zsh inside echo -e
\u21F6
C and C++
\u21F6
C#
\u21F6
CSS
\0021F6
Excel
=UNICHAR(8694)
Go
\u21F6
JavaScript
\u21F6
Modern JavaScript since ES6
\u{21f6}
JSON
\u21F6
Java
\u21F6
Lua
\u{21F6}
Matlab
char(8694)
Perl
"\x{21F6}"
PHP
\u{21f6}
PostgreSQL
U&'\21F6'
PowerShell
`u{21F6}
Python
\u21F6
Ruby
\u{21f6}
Rust
\u{21f6}
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