This character is a Other Letter and is mainly used in the Samaritan script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from right to left. When changing direction it is not mirrored. The word that U+0803 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Dalet (dāleth, also spelled Daleth or Daled) is the fourth letter of the Semitic abjads, including Arabic dālد, Aramaic dālaṯ 𐡃, Hebrew dāletד, Phoenician dālt 𐤃 and Syriac dālaṯ ܕ (in abjadi order; 8th in modern order). Its sound value is the voiced alveolar plosive ([d]).
The letter is based on a glyph of the Proto-Sinaitic script, probably called dalt "door" (door in Modern Hebrew is delet), ultimately based on a hieroglyph depicting a door:
Representations
System
Representation (click value to copy)
Nº
2051
UTF-8
E0 A0 83
UTF-16
08 03
UTF-32
00 00 08 03
URL-Quoted
%E0%A0%83
HTML hex reference
ࠃ
Wrong windows-1252 Mojibake
à ƒ
Encoding: GB18030 (hex bytes)
81 31 B3 35
RFC 5137
\u'0803'
Bash and Zsh inside echo -e
\u0803
C and C++
\u0803
C#
\u0803
CSS
\000803
Excel
=UNICHAR(2051)
Go
\u0803
JavaScript
\u0803
Modern JavaScript since ES6
\u{803}
JSON
\u0803
Java
\u0803
Lua
\u{803}
Matlab
char(2051)
Perl
"\x{803}"
PHP
\u{803}
PostgreSQL
U&'\0803'
PowerShell
`u{803}
Python
\u0803
Ruby
\u{803}
Rust
\u{803}
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