This character is a Other Letter and is mainly used in the Lycian 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+10290 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
El Wikipedia tiene la siguiente información acerca de este punto de código:
The Lycian alphabet was used to write the Lycian language of the Asia Minor region of Lycia. It was an extension of the Greek alphabet, with half a dozen additional letters for sounds not found in Greek. It was largely similar to the Lydian and the Phrygian alphabets.
Representaciones
Sistema
Representación (click value to copy)
N.º
66192
UTF-8
F0 90 8A 90
UTF-16
D8 00 DE 90
UTF-32
00 01 02 90
URL-Quoted
%F0%90%8A%90
HTML hex reference
𐊐
Mojibake mal de windows-1252
ðŠ
Codificación: GB18030 (hexadecimales bytes)
90 30 C2 36
RFC 5137
\u'10290'
Bash and Zsh inside echo -e
\U00010290
C and C++
\U00010290
C#
\U00010290
CSS
\010290
Excel
=UNICHAR(66192)
Go
\U00010290
JavaScript
\uD800\uDE90
Modern JavaScript since ES6
\u{10290}
JSON
\uD800\uDE90
Java
\uD800\uDE90
Lua
\u{10290}
Matlab
char(66192)
Perl
"\x{10290}"
PHP
\u{10290}
PostgreSQL
U&'\+010290'
PowerShell
`u{10290}
Python
\U00010290
Ruby
\u{10290}
Rust
\u{10290}
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