This character is a Nonspacing Mark and is mainly used in the Arabic script. The character is also known as successive dammatan.
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+08F1 prohibits a line break before it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Nunation (Arabic: تَنوِين, tanwīn), in some Semitic languages such as Literary Arabic, is the addition of one of three vowel diacritics (ḥarakāt) to a noun or adjective.
This is used to indicate the word ends in an alveolar nasal without the addition of the letter nūn. The noun phrase is fully declinable and syntactically unmarked for definiteness, identifiable in speech.
Representations
System
Representation (click value to copy)
Nº
2289
UTF-8
E0 A3 B1
UTF-16
08 F1
UTF-32
00 00 08 F1
URL-Quoted
%E0%A3%B1
HTML hex reference
ࣱ
Wrong windows-1252 Mojibake
◌ࣱ
alias
successive dammatan
Encoding: GB18030 (hex bytes)
81 31 CB 33
RFC 5137
\u'08F1'
Bash and Zsh inside echo -e
\u08F1
C and C++
\u08F1
C#
\u08F1
CSS
\0008F1
Excel
=UNICHAR(2289)
Go
\u08F1
JavaScript
\u08F1
Modern JavaScript since ES6
\u{8f1}
JSON
\u08F1
Java
\u08F1
Lua
\u{8F1}
Matlab
char(2289)
Perl
"\x{8F1}"
PHP
\u{8f1}
PostgreSQL
U&'\08F1'
PowerShell
`u{8F1}
Python
\u08F1
Ruby
\u{8f1}
Rust
\u{8f1}
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