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+23FB forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
A power symbol is a symbol indicating that a control activates or deactivates a particular device. Such a control may be a rocker switch, a toggle switch, a push-button, a virtual switch on a display screen, or some other user interface. The internationally standardized symbols are intended to communicate their function in a language-independent manner.
Representations
System
Representation (click value to copy)
Nº
9211
UTF-8
E2 8F BB
UTF-16
23 FB
UTF-32
00 00 23 FB
URL-Quoted
%E2%8F%BB
HTML hex reference
⏻
Wrong windows-1252 Mojibake
â»
Encoding: GB18030 (hex bytes)
81 37 82 35
RFC 5137
\u'23FB'
Bash and Zsh inside echo -e
\u23FB
C and C++
\u23FB
C#
\u23FB
CSS
\0023FB
Excel
=UNICHAR(9211)
Go
\u23FB
JavaScript
\u23FB
Modern JavaScript since ES6
\u{23fb}
JSON
\u23FB
Java
\u23FB
Lua
\u{23FB}
Matlab
char(9211)
Perl
"\x{23FB}"
PHP
\u{23fb}
PostgreSQL
U&'\23FB'
PowerShell
`u{23FB}
Python
\u23FB
Ruby
\u{23fb}
Rust
\u{23fb}
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