This character is a Nonspacing Mark and is mainly used in the Hebrew script.
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+059E prohibits a line break before it.
The Wikipedia has the following information about this codepoint:
Gershayim (Hebrew: גֵּרְשַׁיִם, with variant English spellings) is a cantillation mark that is found in the Torah, Haftarah, and other books of the Hebrew Bible.
The Hebrew word גֵּרְשַׁיִם translates into English as double geresh.
Representations
System
Representation (click value to copy)
Nº
1438
UTF-8
D6 9E
UTF-16
05 9E
UTF-32
00 00 05 9E
URL-Quoted
%D6%9E
HTML hex reference
֞
Wrong windows-1252 Mojibake
◌֞
Encoding: GB18030 (hex bytes)
81 30 F4 32
Adobe Glyph List
gershayimaccenthebrew
RFC 5137
\u'059E'
Bash and Zsh inside echo -e
\u059E
C and C++
\u059E
C#
\u059E
CSS
\00059E
Excel
=UNICHAR(1438)
Go
\u059E
JavaScript
\u059E
Modern JavaScript since ES6
\u{59e}
JSON
\u059E
Java
\u059E
Lua
\u{59E}
Matlab
char(1438)
Perl
"\x{59E}"
PHP
\u{59e}
PostgreSQL
U&'\059E'
PowerShell
`u{59E}
Python
\u059E
Ruby
\u{59e}
Rust
\u{59e}
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