This character is a Other 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+239A forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
clear is a computer operating system command which is used to bring the command line on top of the computer terminal. It is available in various Unix shells on Unix and Unix-like operating systems as well as on other systems such as KolibriOS.
Depending on the system, clear uses the terminfo or termcap database, as well as looking into the environment for the terminal type in order to deduce how to clear the screen. The Unix command clear takes no arguments and is roughly analogous to the command cls on a number of other operating systems.
In ISO 9995-7 specifies that the following symbol be used to indicate this function on a keyboard, which is included in Unicode as: ⎚ CLEAR SCREEN SYMBOL.
One may use the reset command to erase every previous command.
Representations
System
Representation (click value to copy)
Nº
9114
UTF-8
E2 8E 9A
UTF-16
23 9A
UTF-32
00 00 23 9A
URL-Quoted
%E2%8E%9A
HTML hex reference
⎚
Wrong windows-1252 Mojibake
⎚
Encoding: GB18030 (hex bytes)
81 36 F6 38
RFC 5137
\u'239A'
Bash and Zsh inside echo -e
\u239A
C and C++
\u239A
C#
\u239A
CSS
\00239A
Excel
=UNICHAR(9114)
Go
\u239A
JavaScript
\u239A
Modern JavaScript since ES6
\u{239a}
JSON
\u239A
Java
\u239A
Lua
\u{239A}
Matlab
char(9114)
Perl
"\x{239A}"
PHP
\u{239a}
PostgreSQL
U&'\239A'
PowerShell
`u{239A}
Python
\u239A
Ruby
\u{239a}
Rust
\u{239a}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)