This character is a Other Letter and is mainly used in the Lepcha 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+1C03 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Lepcha script, or Róng script, is an abugida used by the Lepcha people to write the Lepcha language. Unusually for an abugida, syllable-final consonants are written as diacritics.
Representations
System
Representation (click value to copy)
Nº
7171
UTF-8
E1 B0 83
UTF-16
1C 03
UTF-32
00 00 1C 03
URL-Quoted
%E1%B0%83
HTML hex reference
ᰃ
Wrong windows-1252 Mojibake
á°ƒ
Encoding: GB18030 (hex bytes)
81 35 BB 35
RFC 5137
\u'1C03'
Bash and Zsh inside echo -e
\u1C03
C and C++
\u1C03
C#
\u1C03
CSS
\001C03
Excel
=UNICHAR(7171)
Go
\u1C03
JavaScript
\u1C03
Modern JavaScript since ES6
\u{1c03}
JSON
\u1C03
Java
\u1C03
Lua
\u{1C03}
Matlab
char(7171)
Perl
"\x{1C03}"
PHP
\u{1c03}
PostgreSQL
U&'\1C03'
PowerShell
`u{1C03}
Python
\u1C03
Ruby
\u{1c03}
Rust
\u{1c03}
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