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+0646 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 45 other glyphs.
The Wikipedia has the following information about this codepoint:
Nun is the fourteenth letter of the Semitic abjads, including Phoenician nūn 𐤍, Hebrew nūnנ, Aramaic nūn 𐡍, Syriac nūn ܢ, and Arabic nūnن (in abjadi order). Its numerical value is 50. It is the third letter in Thaana (ނ), pronounced as "noonu". In all languages, it represents the alveolar nasal /n/.
The Phoenician letter gave rise to the Greek nu (Ν), Etruscan , Latin N, and Cyrillic Н.
Representations
System
Representation (click value to copy)
Nº
1606
UTF-8
D9 86
UTF-16
06 46
UTF-32
00 00 06 46
URL-Quoted
%D9%86
HTML hex reference
ن
Wrong windows-1252 Mojibake
Ù†
Encoding: CP720 (hex bytes)
EB
Encoding: CP1256 (hex bytes)
E4
Encoding: GB18030 (hex bytes)
81 31 87 30
Encoding: ISO8859_6 (hex bytes)
E6
Encoding: CP420 (hex bytes)
BD
Adobe Glyph List
afii57446
Adobe Glyph List
noonarabic
digraph
n+
RFC 5137
\u'0646'
Bash and Zsh inside echo -e
\u0646
C and C++
\u0646
C#
\u0646
CSS
\000646
Excel
=UNICHAR(1606)
Go
\u0646
JavaScript
\u0646
Modern JavaScript since ES6
\u{646}
JSON
\u0646
Java
\u0646
Lua
\u{646}
Matlab
char(1606)
Perl
"\x{646}"
PHP
\u{646}
PostgreSQL
U&'\0646'
PowerShell
`u{646}
Python
\u0646
Ruby
\u{646}
Rust
\u{646}
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