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+0691 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Ṛe, also Aṛ, is a letter of the extended Arabic alphabet, based on rāʾ (ر) with the addition of a diacritical ṭāʾ (ط; historically four dots in a square pattern, e.g. ڙ) on top. It is not used in the Arabic alphabet itself, but is used to represent the word-medial and word-final retroflex flap [ɽ] in Urdu, Punjabi written in the Shahmukhi script, and Kashmiri. The small t̤oʾe diacritic is used to indicate a retroflex consonant in Urdu. Its Abjad value is considered to be 200. In Urdu, this letter may also be called rā-ye-musaqqalā ("heavy re") or rā-ye-hindiyā ("Indian re"). In Devanagari, this consonant is rendered using ‘ड़’ (‘ड’ with nuqta below).
Representations
System
Representation (click value to copy)
Nº
1681
UTF-8
DA 91
UTF-16
06 91
UTF-32
00 00 06 91
URL-Quoted
%DA%91
HTML hex reference
ڑ
Wrong windows-1252 Mojibake
Ú‘
Encoding: CP1256 (hex bytes)
9A
Encoding: GB18030 (hex bytes)
81 31 8E 35
Adobe Glyph List
afii57513
Adobe Glyph List
rreharabic
RFC 5137
\u'0691'
Bash and Zsh inside echo -e
\u0691
C and C++
\u0691
C#
\u0691
CSS
\000691
Excel
=UNICHAR(1681)
Go
\u0691
JavaScript
\u0691
Modern JavaScript since ES6
\u{691}
JSON
\u0691
Java
\u0691
Lua
\u{691}
Matlab
char(1681)
Perl
"\x{691}"
PHP
\u{691}
PostgreSQL
U&'\0691'
PowerShell
`u{691}
Python
\u0691
Ruby
\u{691}
Rust
\u{691}
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