This character is a Other Letter and is mainly used in the Limbu script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+1904 forms with similar adjacent characters prevents a line break inside it.
El Wikipedia tiene la siguiente información acerca de este punto de código:
The Limbu script (also Sirijanga script) is used to write the Limbu language. It is a Brahmic type abugida.
Representaciones
Sistema
Representación (click value to copy)
N.º
6404
UTF-8
E1 A4 84
UTF-16
19 04
UTF-32
00 00 19 04
URL-Quoted
%E1%A4%84
HTML hex reference
ᤄ
Mojibake mal de windows-1252
ᤄ
Codificación: GB18030 (hexadecimales bytes)
81 34 EC 38
RFC 5137
\u'1904'
Bash and Zsh inside echo -e
\u1904
C and C++
\u1904
C#
\u1904
CSS
\001904
Excel
=UNICHAR(6404)
Go
\u1904
JavaScript
\u1904
Modern JavaScript since ES6
\u{1904}
JSON
\u1904
Java
\u1904
Lua
\u{1904}
Matlab
char(6404)
Perl
"\x{1904}"
PHP
\u{1904}
PostgreSQL
U&'\1904'
PowerShell
`u{1904}
Python
\u1904
Ruby
\u{1904}
Rust
\u{1904}
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