This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as stop.
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+23F9 forms with similar adjacent characters prevents a line break inside it.
The CLDR project calls this character “stop button” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: button, square, stop.
This character is designated as an emoji. It will be rendered as monochrome character on conforming platforms. To enable colorful emoji display, you can combine it with Variation Selector-16: ⏹️ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
In digital electronics, analogue electronics and entertainment, the user interface may include media controls, transport controls or player controls, to enact and change or adjust the process of video playback, audio playback, and alike. These controls are commonly depicted as widely known symbols found in a multitude of products, exemplifying what is known as dominant design.
Representations
System
Representation (click value to copy)
Nº
9209
UTF-8
E2 8F B9
UTF-16
23 F9
UTF-32
00 00 23 F9
URL-Quoted
%E2%8F%B9
HTML hex reference
⏹
Wrong windows-1252 Mojibake
â¹
alias
stop
Encoding: GB18030 (hex bytes)
81 37 82 33
RFC 5137
\u'23F9'
Bash and Zsh inside echo -e
\u23F9
C and C++
\u23F9
C#
\u23F9
CSS
\0023F9
Excel
=UNICHAR(9209)
Go
\u23F9
JavaScript
\u23F9
Modern JavaScript since ES6
\u{23f9}
JSON
\u23F9
Java
\u23F9
Lua
\u{23F9}
Matlab
char(9209)
Perl
"\x{23F9}"
PHP
\u{23f9}
PostgreSQL
U&'\23F9'
PowerShell
`u{23F9}
Python
\u23F9
Ruby
\u{23f9}
Rust
\u{23f9}
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