This character is a Nonspacing Mark and inherits its script property from the preceding character. It is also used in the scripts Hiragana, Katakana.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Nonspacing Mark. When changing direction it is not mirrored. U+3099 prohibits a line break before it.
The Wikipedia has the following information about this codepoint:
The dakuten (Japanese: 濁点, Japanese pronunciation:[dakɯ̥teꜜɴ] or [dakɯ̥teɴ], lit. "voicing mark"), colloquially ten-ten (点々, "dots"), is a diacritic most often used in the Japanese kana syllabaries to indicate that the consonant of a mora should be pronounced voiced, for instance, on sounds that have undergone rendaku (sequential voicing).
The handakuten (半濁点, Japanese pronunciation:[handaꜜkɯ̥teɴ], lit. "half voicing mark"), colloquially maru (丸, "circle"), is a diacritic used with kana for morae pronounced with /h/ or /f/ to indicate that they should instead be pronounced with /p/.
Representations
System
Representation (click value to copy)
Nº
12441
UTF-8
E3 82 99
UTF-16
30 99
UTF-32
00 00 30 99
URL-Quoted
%E3%82%99
HTML hex reference
゙
Wrong windows-1252 Mojibake
◌゙
Encoding: GB18030 (hex bytes)
81 39 A7 31
RFC 5137
\u'3099'
Bash and Zsh inside echo -e
\u3099
C and C++
\u3099
C#
\u3099
CSS
\003099
Excel
=UNICHAR(12441)
Go
\u3099
JavaScript
\u3099
Modern JavaScript since ES6
\u{3099}
JSON
\u3099
Java
\u3099
Lua
\u{3099}
Matlab
char(12441)
Perl
"\x{3099}"
PHP
\u{3099}
PostgreSQL
U&'\3099'
PowerShell
`u{3099}
Python
\u3099
Ruby
\u{3099}
Rust
\u{3099}
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