This character is a Lowercase Letter and is mainly used in the Georgian script. Its uppercase variant is Georgian Mtavruli Capital Letter Un.
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+10E3 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Uni (asomtavruli ႭჃ, later Ⴓ, nuskhuri ⴍⴣ, later ⴓ, mkhedruli უ, mtavruli Უ) is the 23rd letter of the three Georgian scripts.
In the system of Georgian numerals it has a value of 400 as letter Vie.
Uni commonly represents the close back rounded vowel /u/, like the pronunciation of ⟨oo⟩ in "boot".
Representations
System
Representation (click value to copy)
Nº
4323
UTF-8
E1 83 A3
UTF-16
10 E3
UTF-32
00 00 10 E3
URL-Quoted
%E1%83%A3
HTML hex reference
უ
Wrong windows-1252 Mojibake
უ
Encoding: GB18030 (hex bytes)
81 33 9A 37
RFC 5137
\u'10E3'
Bash and Zsh inside echo -e
\u10E3
C and C++
\u10E3
C#
\u10E3
CSS
\0010E3
Excel
=UNICHAR(4323)
Go
\u10E3
JavaScript
\u10E3
Modern JavaScript since ES6
\u{10e3}
JSON
\u10E3
Java
\u10E3
Lua
\u{10E3}
Matlab
char(4323)
Perl
"\x{10E3}"
PHP
\u{10e3}
PostgreSQL
U&'\10E3'
PowerShell
`u{10E3}
Python
\u10E3
Ruby
\u{10e3}
Rust
\u{10e3}
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