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+1909 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
6409
UTF-8
E1 A4 89
UTF-16
19 09
UTF-32
00 00 19 09
URL-Quoted
%E1%A4%89
HTML hex reference
ᤉ
Wrong windows-1252 Mojibake
ᤉ
Encoding: GB18030 (hex bytes)
81 34 ED 33
RFC 5137
\u'1909'
Bash and Zsh inside echo -e
\u1909
C and C++
\u1909
C#
\u1909
CSS
\001909
Excel
=UNICHAR(6409)
Go
\u1909
JavaScript
\u1909
Modern JavaScript since ES6
\u{1909}
JSON
\u1909
Java
\u1909
Lua
\u{1909}
Matlab
char(6409)
Perl
"\x{1909}"
PHP
\u{1909}
PostgreSQL
U&'\1909'
PowerShell
`u{1909}
Python
\u1909
Ruby
\u{1909}
Rust
\u{1909}
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