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+2913 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Scroll Lock (⤓ or ⇳) is a lock key (typically with an associated status light) on most IBM-compatible computer keyboards. Depending on the operating system, it may be used for different purposes, and applications may assign functions to the key or change their behavior depending on its toggling state. The key is not frequently used, and therefore some reduced or specialized keyboards lack Scroll Lock altogether.
Pressing Ctrl+Scroll Lock performs the same function as pressing Ctrl+Pause/Break. This behavior is a remnant of the original IBM PC keyboards, which did not have a dedicated Pause/Break key. Instead, they assigned the Pause function to Ctrl+Num Lock and the Break function to Ctrl+Scroll Lock.
Representations
System
Representation (click value to copy)
Nº
10515
UTF-8
E2 A4 93
UTF-16
29 13
UTF-32
00 00 29 13
URL-Quoted
%E2%A4%93
HTML hex reference
⤓
Wrong windows-1252 Mojibake
⤓
HTML named entity
⤓
Encoding: GB18030 (hex bytes)
81 37 F0 39
LATEX
\DownArrowBar
RFC 5137
\u'2913'
Bash and Zsh inside echo -e
\u2913
C and C++
\u2913
C#
\u2913
CSS
\002913
Excel
=UNICHAR(10515)
Go
\u2913
JavaScript
\u2913
Modern JavaScript since ES6
\u{2913}
JSON
\u2913
Java
\u2913
Lua
\u{2913}
Matlab
char(10515)
Perl
"\x{2913}"
PHP
\u{2913}
PostgreSQL
U&'\2913'
PowerShell
`u{2913}
Python
\u2913
Ruby
\u{2913}
Rust
\u{2913}
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