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+0644 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 63 other glyphs.
The Wikipedia has the following information about this codepoint:
Lamedh or lamed is the twelfth letter of the Semitic abjads, including Hebrew lāmeḏל, Aramaic lāmaḏ 𐡋, Syriac lāmaḏ ܠ, Arabic lāmل, and Phoenician lāmd 𐤋. Its sound value is [l].
The Phoenician letter gave rise to the Greek Lambda (Λ), Latin L, and Cyrillic El (Л).
Representations
System
Representation (click value to copy)
Nº
1604
UTF-8
D9 84
UTF-16
06 44
UTF-32
00 00 06 44
URL-Quoted
%D9%84
HTML hex reference
ل
Wrong windows-1252 Mojibake
Ù„
Encoding: CP720 (hex bytes)
E9
Encoding: CP1256 (hex bytes)
E1
Encoding: GB18030 (hex bytes)
81 31 86 38
Encoding: ISO8859_6 (hex bytes)
E4
Encoding: CP420 (hex bytes)
B1
Adobe Glyph List
afii57444
Adobe Glyph List
lamarabic
digraph
l+
RFC 5137
\u'0644'
Bash and Zsh inside echo -e
\u0644
C and C++
\u0644
C#
\u0644
CSS
\000644
Excel
=UNICHAR(1604)
Go
\u0644
JavaScript
\u0644
Modern JavaScript since ES6
\u{644}
JSON
\u0644
Java
\u0644
Lua
\u{644}
Matlab
char(1604)
Perl
"\x{644}"
PHP
\u{644}
PostgreSQL
U&'\0644'
PowerShell
`u{644}
Python
\u0644
Ruby
\u{644}
Rust
\u{644}
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