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+190F 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
6415
UTF-8
E1 A4 8F
UTF-16
19 0F
UTF-32
00 00 19 0F
URL-Quoted
%E1%A4%8F
HTML hex reference
ᤏ
Wrong windows-1252 Mojibake
á¤
Encoding: GB18030 (hex bytes)
81 34 ED 39
RFC 5137
\u'190F'
Bash and Zsh inside echo -e
\u190F
C and C++
\u190F
C#
\u190F
CSS
\00190F
Excel
=UNICHAR(6415)
Go
\u190F
JavaScript
\u190F
Modern JavaScript since ES6
\u{190f}
JSON
\u190F
Java
\u190F
Lua
\u{190F}
Matlab
char(6415)
Perl
"\x{190F}"
PHP
\u{190f}
PostgreSQL
U&'\190F'
PowerShell
`u{190F}
Python
\u190F
Ruby
\u{190f}
Rust
\u{190f}
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