This character is a Other Number and is commonly used, that is, in no specific script. It is also used in the scripts Cypriot syllabary, Linear A, Linear B. The codepoint has the numeric value 2.
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+10108 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Aegean numbers was an additive sign-value numeral system used by the Minoan and Mycenaean civilizations. They are attested in the Linear A and Linear B scripts. They may have survived in the Cypro-Minoan script, where a single sign with "100" value is attested so far on a large clay tablet from Enkomi.
Representations
System
Representation (click value to copy)
NΒΊ
65800
UTF-8
F0 90 84 88
UTF-16
D8 00 DD 08
UTF-32
00 01 01 08
URL-Quoted
%F0%90%84%88
HTML hex reference
𐄈
Wrong windows-1252 Mojibake
Γ°ΒβΛ
Encoding: GB18030 (hex bytes)
90 30 9B 34
RFC 5137
\u'10108'
Bash and Zsh inside echo -e
\U00010108
C and C++
\U00010108
C#
\U00010108
CSS
\010108
Excel
=UNICHAR(65800)
Go
\U00010108
JavaScript
\uD800\uDD08
Modern JavaScript since ES6
\u{10108}
JSON
\uD800\uDD08
Java
\uD800\uDD08
Lua
\u{10108}
Matlab
char(65800)
Perl
"\x{10108}"
PHP
\u{10108}
PostgreSQL
U&'\+010108'
PowerShell
`u{10108}
Python
\U00010108
Ruby
\u{10108}
Rust
\u{10108}
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