This character is a Other Punctuation and is commonly used, that is, in no specific script. It is also used in the scripts Bopomofo, Hangul, Han, Hiragana, Katakana.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+3003 offers a line break opportunity at its position, except in some numeric contexts. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
The ditto mark is a shorthand sign, used mostly in hand-written text, indicating that the words or figures above it are to be repeated.
The mark is made using "a pair of apostrophes"; "a pair of marks " used underneath a word"; the symbol " (quotation mark); or the symbol ” (right double quotation mark).
In the following example, the second line reads "Blue pens, box of twenty".
Black pens, box of twenty ... $2.10
Blue " " " " ... $2.35
Representations
System
Representation (click value to copy)
Nº
12291
UTF-8
E3 80 83
UTF-16
30 03
UTF-32
00 00 30 03
URL-Quoted
%E3%80%83
HTML hex reference
〃
Wrong windows-1252 Mojibake
〃
Encoding: BIG5 (hex bytes)
A1 B2
Encoding: BIG5HKSCS (hex bytes)
A1 B2
Encoding: CP932 (hex bytes)
81 56
Encoding: CP949 (hex bytes)
A1 A8
Encoding: CP950 (hex bytes)
A1 B2
Encoding: EUC_JP (hex bytes)
A1 B7
Encoding: EUC_JIS_2004 (hex bytes)
A1 B7
Encoding: EUC_JISX0213 (hex bytes)
A1 B7
Encoding: EUC_KR (hex bytes)
A1 A8
Encoding: GB2312 (hex bytes)
A1 A8
Encoding: GBK (hex bytes)
A1 A8
Encoding: GB18030 (hex bytes)
A1 A8
Encoding: HZ (hex bytes)
7E 7B 21 28 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 21 37 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 21 37 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 21 37 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 21 37 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 21 37 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 21 37 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 21 28 0F
Encoding: JOHAB (hex bytes)
D9 38
Encoding: SHIFT_JIS (hex bytes)
81 56
Encoding: SHIFT_JIS_2004 (hex bytes)
81 56
Encoding: SHIFT_JISX0213 (hex bytes)
81 56
Adobe Glyph List
dittomark
digraph
+"
RFC 5137
\u'3003'
Bash and Zsh inside echo -e
\u3003
C and C++
\u3003
C#
\u3003
CSS
\003003
Excel
=UNICHAR(12291)
Go
\u3003
JavaScript
\u3003
Modern JavaScript since ES6
\u{3003}
JSON
\u3003
Java
\u3003
Lua
\u{3003}
Matlab
char(12291)
Perl
"\x{3003}"
PHP
\u{3003}
PostgreSQL
U&'\3003'
PowerShell
`u{3003}
Python
\u3003
Ruby
\u{3003}
Rust
\u{3003}
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