This character is a Nonspacing Mark and is mainly used in the Arabic script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Nonspacing Mark. When changing direction it is not mirrored. U+0659 prohibits a line break before it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
The Pashto alphabet (Pashto: پښتو الفبې, romanized: Pəx̌tó alfbâye) is the right-to-left abjad-based alphabet developed from the Arabic script, used for the Pashto language in Pakistan and Afghanistan. It originated in the 16th century through the works of Pir Roshan.
Representations
System
Representation (click value to copy)
Nº
1625
UTF-8
D9 99
UTF-16
06 59
UTF-32
00 00 06 59
URL-Quoted
%D9%99
HTML hex reference
ٙ
Wrong windows-1252 Mojibake
◌ٙ
Encoding: GB18030 (hex bytes)
81 31 88 39
RFC 5137
\u'0659'
Bash and Zsh inside echo -e
\u0659
C and C++
\u0659
C#
\u0659
CSS
\000659
Excel
=UNICHAR(1625)
Go
\u0659
JavaScript
\u0659
Modern JavaScript since ES6
\u{659}
JSON
\u0659
Java
\u0659
Lua
\u{659}
Matlab
char(1625)
Perl
"\x{659}"
PHP
\u{659}
PostgreSQL
U&'\0659'
PowerShell
`u{659}
Python
\u0659
Ruby
\u{659}
Rust
\u{659}
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