This character is a Other Letter 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 is written as Arabic letter from right to left. When changing direction it is not mirrored. The word that U+0684 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 4 other glyphs.
The Wikipedia has the following information about this codepoint:
ڄ, Arabic letter dyeh (U+0684), is an additional letter of the Arabic script, not used in the Arabic alphabet itself but used in Sindhi and Saraiki to represent a voiced palatal implosive, [ʄ]. For ڄ example is used in ڄموں، ڄلم۔ It is written as ॼ in Saraiki and Sindhi's Devanagari orthography.
Representations
System
Representation (click value to copy)
Nº
1668
UTF-8
DA 84
UTF-16
06 84
UTF-32
00 00 06 84
URL-Quoted
%DA%84
HTML hex reference
ڄ
Wrong windows-1252 Mojibake
Ú„
Encoding: GB18030 (hex bytes)
81 31 8D 32
RFC 5137
\u'0684'
Bash and Zsh inside echo -e
\u0684
C and C++
\u0684
C#
\u0684
CSS
\000684
Excel
=UNICHAR(1668)
Go
\u0684
JavaScript
\u0684
Modern JavaScript since ES6
\u{684}
JSON
\u0684
Java
\u0684
Lua
\u{684}
Matlab
char(1668)
Perl
"\x{684}"
PHP
\u{684}
PostgreSQL
U&'\0684'
PowerShell
`u{684}
Python
\u0684
Ruby
\u{684}
Rust
\u{684}
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