This character is a Decimal Number and is mainly used in the Arabic script. It is also used in the scripts Thaana, Yezidi. The codepoint has the decimal value 8.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written as Arabic number from right to left. When changing direction it is not mirrored. This number joins with other adjacent letters and numbers to form a word. U+0668 forms a number with similar characters, which prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
8 (eight) is the natural number following 7 and preceding 9.
Representations
System
Representation (click value to copy)
Nº
1640
UTF-8
D9 A8
UTF-16
06 68
UTF-32
00 00 06 68
URL-Quoted
%D9%A8
HTML hex reference
٨
Wrong windows-1252 Mojibake
Ù¨
Encoding: CP864 (hex bytes)
B8
Encoding: GB18030 (hex bytes)
81 31 8A 34
Encoding: CP420 (hex bytes)
FD
Adobe Glyph List
afii57400
Adobe Glyph List
eightarabic
Adobe Glyph List
eighthackarabic
RFC 5137
\u'0668'
Bash and Zsh inside echo -e
\u0668
C and C++
\u0668
C#
\u0668
CSS
\000668
Excel
=UNICHAR(1640)
Go
\u0668
JavaScript
\u0668
Modern JavaScript since ES6
\u{668}
JSON
\u0668
Java
\u0668
Lua
\u{668}
Matlab
char(1640)
Perl
"\x{668}"
PHP
\u{668}
PostgreSQL
U&'\0668'
PowerShell
`u{668}
Python
\u0668
Ruby
\u{668}
Rust
\u{668}
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