This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+1F4EF offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “postal horn” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: horn, post, postal.
This character is designated as an emoji. It will be rendered as colorful emoji on conforming platforms. To reduce it to a monochrome character, you can combine it with Variation Selector-15: 📯︎ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
The post horn is a valveless cylindrical brass instrument with a cupped mouthpiece. The instrument was used to signal the arrival or departure of a post rider or mail coach. It was used by postilions of the 18th and 19th centuries.
Representations
System
Representation (click value to copy)
Nº
128239
UTF-8
F0 9F 93 AF
UTF-16
D8 3D DC EF
UTF-32
00 01 F4 EF
URL-Quoted
%F0%9F%93%AF
HTML hex reference
📯
Wrong windows-1252 Mojibake
📯
Encoding: GB18030 (hex bytes)
94 39 E1 33
RFC 5137
\u'1F4EF'
Bash and Zsh inside echo -e
\U0001F4EF
C and C++
\U0001F4EF
C#
\U0001F4EF
CSS
\01F4EF
Excel
=UNICHAR(128239)
Go
\U0001F4EF
JavaScript
\uD83D\uDCEF
Modern JavaScript since ES6
\u{1f4ef}
JSON
\uD83D\uDCEF
Java
\uD83D\uDCEF
Lua
\u{1F4EF}
Matlab
char(128239)
Perl
"\x{1F4EF}"
PHP
\u{1f4ef}
PostgreSQL
U&'\+01F4EF'
PowerShell
`u{1F4EF}
Python
\U0001F4EF
Ruby
\u{1f4ef}
Rust
\u{1f4ef}
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