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+1028E forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
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.
Representations
System
Representation (click value to copy)
NΒΊ
66190
UTF-8
F0 90 8A 8E
UTF-16
D8 00 DE 8E
UTF-32
00 01 02 8E
URL-Quoted
%F0%90%8A%8E
HTML hex reference
𐊎
Wrong windows-1252 Mojibake
Γ°ΒΕ Ε½
Encoding: GB18030 (hex bytes)
90 30 C2 34
RFC 5137
\u'1028E'
Bash and Zsh inside echo -e
\U0001028E
C and C++
\U0001028E
C#
\U0001028E
CSS
\01028E
Excel
=UNICHAR(66190)
Go
\U0001028E
JavaScript
\uD800\uDE8E
Modern JavaScript since ES6
\u{1028e}
JSON
\uD800\uDE8E
Java
\uD800\uDE8E
Lua
\u{1028E}
Matlab
char(66190)
Perl
"\x{1028E}"
PHP
\u{1028e}
PostgreSQL
U&'\+01028E'
PowerShell
`u{1028E}
Python
\U0001028E
Ruby
\u{1028e}
Rust
\u{1028e}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)