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+190E 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
6414
UTF-8
E1 A4 8E
UTF-16
19 0E
UTF-32
00 00 19 0E
URL-Quoted
%E1%A4%8E
HTML hex reference
ᤎ
Wrong windows-1252 Mojibake
ᤎ
Encoding: GB18030 (hex bytes)
81 34 ED 38
RFC 5137
\u'190E'
Bash and Zsh inside echo -e
\u190E
C and C++
\u190E
C#
\u190E
CSS
\00190E
Excel
=UNICHAR(6414)
Go
\u190E
JavaScript
\u190E
Modern JavaScript since ES6
\u{190e}
JSON
\u190E
Java
\u190E
Lua
\u{190E}
Matlab
char(6414)
Perl
"\x{190E}"
PHP
\u{190e}
PostgreSQL
U&'\190E'
PowerShell
`u{190E}
Python
\u190E
Ruby
\u{190e}
Rust
\u{190e}
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