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+1901 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
6401
UTF-8
E1 A4 81
UTF-16
19 01
UTF-32
00 00 19 01
URL-Quoted
%E1%A4%81
HTML hex reference
ᤁ
Wrong windows-1252 Mojibake
á¤
Encoding: GB18030 (hex bytes)
81 34 EC 35
RFC 5137
\u'1901'
Bash and Zsh inside echo -e
\u1901
C and C++
\u1901
C#
\u1901
CSS
\001901
Excel
=UNICHAR(6401)
Go
\u1901
JavaScript
\u1901
Modern JavaScript since ES6
\u{1901}
JSON
\u1901
Java
\u1901
Lua
\u{1901}
Matlab
char(6401)
Perl
"\x{1901}"
PHP
\u{1901}
PostgreSQL
U&'\1901'
PowerShell
`u{1901}
Python
\u1901
Ruby
\u{1901}
Rust
\u{1901}
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