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+1919 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Limbu script (also Sirijanga script) is used to write the Limbu language. It is a Brahmic type abugida.
Representations
System
Representation (click value to copy)
Nº
6425
UTF-8
E1 A4 99
UTF-16
19 19
UTF-32
00 00 19 19
URL-Quoted
%E1%A4%99
HTML hex reference
ᤙ
Wrong windows-1252 Mojibake
ᤙ
Encoding: GB18030 (hex bytes)
81 34 EE 39
RFC 5137
\u'1919'
Bash and Zsh inside echo -e
\u1919
C and C++
\u1919
C#
\u1919
CSS
\001919
Excel
=UNICHAR(6425)
Go
\u1919
JavaScript
\u1919
Modern JavaScript since ES6
\u{1919}
JSON
\u1919
Java
\u1919
Lua
\u{1919}
Matlab
char(6425)
Perl
"\x{1919}"
PHP
\u{1919}
PostgreSQL
U&'\1919'
PowerShell
`u{1919}
Python
\u1919
Ruby
\u{1919}
Rust
\u{1919}
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