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+10289 forms with similar adjacent characters prevents a line break inside it.
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
66185
UTF-8
F0 90 8A 89
UTF-16
D8 00 DE 89
UTF-32
00 01 02 89
URL-Quoted
%F0%90%8A%89
HTML hex reference
𐊉
Mojibake mal de windows-1252
ðŠ‰
Codificación: GB18030 (hexadecimales bytes)
90 30 C1 39
RFC 5137
\u'10289'
Bash and Zsh inside echo -e
\U00010289
C and C++
\U00010289
C#
\U00010289
CSS
\010289
Excel
=UNICHAR(66185)
Go
\U00010289
JavaScript
\uD800\uDE89
Modern JavaScript since ES6
\u{10289}
JSON
\uD800\uDE89
Java
\uD800\uDE89
Lua
\u{10289}
Matlab
char(66185)
Perl
"\x{10289}"
PHP
\u{10289}
PostgreSQL
U&'\+010289'
PowerShell
`u{10289}
Python
\U00010289
Ruby
\u{10289}
Rust
\u{10289}
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