This character is a Other Letter and is mainly used in the Cypriot syllabary script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from right to left. When changing direction it is not mirrored. The word that U+10818 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Cypriot or Cypriote syllabary (also Classical Cypriot Syllabary) is a syllabic script used in Iron Age Cyprus, from about the 11th to the 4th centuries BCE, when it was replaced by the Greek alphabet. It has been suggested that the script remained in use as late as the 1st century BC. A pioneer of that change was King Evagoras of Salamis. It is thought to be descended from the Cypro-Minoan syllabary, itself a variant or derivative of Linear A. Most texts using the script are in the Arcadocypriot dialect of Greek, but also one bilingual (Greek and Eteocypriot) inscription was found in Amathus.
Representations
System
Representation (click value to copy)
NΒΊ
67608
UTF-8
F0 90 A0 98
UTF-16
D8 02 DC 18
UTF-32
00 01 08 18
URL-Quoted
%F0%90%A0%98
HTML hex reference
𐠘
Wrong windows-1252 Mojibake
ð Λ
Encoding: GB18030 (hex bytes)
90 31 D2 32
RFC 5137
\u'10818'
Bash and Zsh inside echo -e
\U00010818
C and C++
\U00010818
C#
\U00010818
CSS
\010818
Excel
=UNICHAR(67608)
Go
\U00010818
JavaScript
\uD802\uDC18
Modern JavaScript since ES6
\u{10818}
JSON
\uD802\uDC18
Java
\uD802\uDC18
Lua
\u{10818}
Matlab
char(67608)
Perl
"\x{10818}"
PHP
\u{10818}
PostgreSQL
U&'\+010818'
PowerShell
`u{10818}
Python
\U00010818
Ruby
\u{10818}
Rust
\u{10818}
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