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 6.
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+0666 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:
6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number.
Representations
System
Representation (click value to copy)
Nº
1638
UTF-8
D9 A6
UTF-16
06 66
UTF-32
00 00 06 66
URL-Quoted
%D9%A6
HTML hex reference
٦
Wrong windows-1252 Mojibake
Ù¦
Encoding: CP864 (hex bytes)
B6
Encoding: GB18030 (hex bytes)
81 31 8A 32
Encoding: CP420 (hex bytes)
FB
Adobe Glyph List
afii57398
Adobe Glyph List
sixarabic
Adobe Glyph List
sixhackarabic
RFC 5137
\u'0666'
Bash and Zsh inside echo -e
\u0666
C and C++
\u0666
C#
\u0666
CSS
\000666
Excel
=UNICHAR(1638)
Go
\u0666
JavaScript
\u0666
Modern JavaScript since ES6
\u{666}
JSON
\u0666
Java
\u0666
Lua
\u{666}
Matlab
char(1638)
Perl
"\x{666}"
PHP
\u{666}
PostgreSQL
U&'\0666'
PowerShell
`u{666}
Python
\u0666
Ruby
\u{666}
Rust
\u{666}
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