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 4.
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+0664 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:
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures.
Representations
System
Representation (click value to copy)
Nº
1636
UTF-8
D9 A4
UTF-16
06 64
UTF-32
00 00 06 64
URL-Quoted
%D9%A4
HTML hex reference
٤
Wrong windows-1252 Mojibake
Ù¤
Encoding: CP864 (hex bytes)
B4
Encoding: GB18030 (hex bytes)
81 31 8A 30
Encoding: CP420 (hex bytes)
EE
Adobe Glyph List
afii57396
Adobe Glyph List
fourarabic
Adobe Glyph List
fourhackarabic
RFC 5137
\u'0664'
Bash and Zsh inside echo -e
\u0664
C and C++
\u0664
C#
\u0664
CSS
\000664
Excel
=UNICHAR(1636)
Go
\u0664
JavaScript
\u0664
Modern JavaScript since ES6
\u{664}
JSON
\u0664
Java
\u0664
Lua
\u{664}
Matlab
char(1636)
Perl
"\x{664}"
PHP
\u{664}
PostgreSQL
U&'\0664'
PowerShell
`u{664}
Python
\u0664
Ruby
\u{664}
Rust
\u{664}
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