This character is a Open Punctuation and is commonly used, that is, in no specific script. The character is also known as opening parenthesis (1.0).
The glyph is not a composition. Its East Asian Width is narrow. In bidirectional text it acts as Other Neutral. When changing direction it is mirrored into Glyph for U+0029Right Parenthesis. U+0028 prohibits a line break after it. The glyph can be confused with 155 other glyphs.
The Wikipedia has the following information about this codepoint:
A bracket is either of two tall fore- or back-facing punctuation marks commonly used to isolate a segment of text or data from its surroundings. They come in four main pairs of shapes, as given in the box to the right, which also gives their names, that vary between British and American English. "Brackets", without further qualification, are in British English the (...) marks and in American English the [...] marks.
Other minor bracket shapes exist, such as (for example) slash or diagonal brackets used by linguists to enclose phonemes.
Brackets are typically deployed in symmetric pairs, and an individual bracket may be identified as a 'left' or 'right' bracket or, alternatively, an "opening bracket" or "closing bracket", respectively, depending on the directionality of the context.
In casual writing and in technical fields such as computing or linguistic analysis of grammar, brackets nest, with segments of bracketed material containing embedded within them other further bracketed sub-segments. The number of opening brackets matches the number of closing brackets in such cases.
Various forms of brackets are used in mathematics, with specific mathematical meanings, often for denoting specific mathematical functions and subformulas.
Representations
System
Representation (click value to copy)
Nº
40
UTF-8
28
UTF-16
00 28
UTF-32
00 00 00 28
URL-Quoted
%28
HTML hex reference
(
HTML named entity
(
alias
opening parenthesis (1.0)
Encoding: ASCII (hex bytes)
28
Encoding: BIG5 (hex bytes)
28
Encoding: BIG5HKSCS (hex bytes)
28
Encoding: CP037 (hex bytes)
4D
Encoding: CP273 (hex bytes)
4D
Encoding: CP424 (hex bytes)
4D
Encoding: CP437 (hex bytes)
28
Encoding: CP500 (hex bytes)
4D
Encoding: CP720 (hex bytes)
28
Encoding: CP737 (hex bytes)
28
Encoding: CP775 (hex bytes)
28
Encoding: CP850 (hex bytes)
28
Encoding: CP852 (hex bytes)
28
Encoding: CP855 (hex bytes)
28
Encoding: CP856 (hex bytes)
28
Encoding: CP857 (hex bytes)
28
Encoding: CP858 (hex bytes)
28
Encoding: CP860 (hex bytes)
28
Encoding: CP861 (hex bytes)
28
Encoding: CP862 (hex bytes)
28
Encoding: CP863 (hex bytes)
28
Encoding: CP864 (hex bytes)
28
Encoding: CP865 (hex bytes)
28
Encoding: CP866 (hex bytes)
28
Encoding: CP869 (hex bytes)
28
Encoding: CP874 (hex bytes)
28
Encoding: CP875 (hex bytes)
4D
Encoding: CP932 (hex bytes)
28
Encoding: CP949 (hex bytes)
28
Encoding: CP950 (hex bytes)
28
Encoding: CP1006 (hex bytes)
28
Encoding: CP1026 (hex bytes)
4D
Encoding: CP1125 (hex bytes)
28
Encoding: CP1140 (hex bytes)
4D
Encoding: CP1250 (hex bytes)
28
Encoding: CP1251 (hex bytes)
28
Encoding: CP1252 (hex bytes)
28
Encoding: CP1253 (hex bytes)
28
Encoding: CP1254 (hex bytes)
28
Encoding: CP1255 (hex bytes)
28
Encoding: CP1256 (hex bytes)
28
Encoding: CP1257 (hex bytes)
28
Encoding: CP1258 (hex bytes)
28
Encoding: EUC_JP (hex bytes)
28
Encoding: EUC_JIS_2004 (hex bytes)
28
Encoding: EUC_JISX0213 (hex bytes)
28
Encoding: EUC_KR (hex bytes)
28
Encoding: GB2312 (hex bytes)
28
Encoding: GBK (hex bytes)
28
Encoding: GB18030 (hex bytes)
28
Encoding: HZ (hex bytes)
28
Encoding: ISO2022_JP (hex bytes)
28
Encoding: ISO2022_JP_1 (hex bytes)
28
Encoding: ISO2022_JP_2 (hex bytes)
28
Encoding: ISO2022_JP_2004 (hex bytes)
28
Encoding: ISO2022_JP_3 (hex bytes)
28
Encoding: ISO2022_JP_EXT (hex bytes)
28
Encoding: ISO2022_KR (hex bytes)
28
Encoding: LATIN_1 (hex bytes)
28
Encoding: ISO8859_2 (hex bytes)
28
Encoding: ISO8859_3 (hex bytes)
28
Encoding: ISO8859_4 (hex bytes)
28
Encoding: ISO8859_5 (hex bytes)
28
Encoding: ISO8859_6 (hex bytes)
28
Encoding: ISO8859_7 (hex bytes)
28
Encoding: ISO8859_8 (hex bytes)
28
Encoding: ISO8859_9 (hex bytes)
28
Encoding: ISO8859_10 (hex bytes)
28
Encoding: ISO8859_11 (hex bytes)
28
Encoding: ISO8859_13 (hex bytes)
28
Encoding: ISO8859_14 (hex bytes)
28
Encoding: ISO8859_15 (hex bytes)
28
Encoding: ISO8859_16 (hex bytes)
28
Encoding: JOHAB (hex bytes)
28
Encoding: KOI8_R (hex bytes)
28
Encoding: KOI8_T (hex bytes)
28
Encoding: KOI8_U (hex bytes)
28
Encoding: KZ1048 (hex bytes)
28
Encoding: MAC_CYRILLIC (hex bytes)
28
Encoding: MAC_GREEK (hex bytes)
28
Encoding: MAC_ICELAND (hex bytes)
28
Encoding: MAC_LATIN2 (hex bytes)
28
Encoding: MAC_ROMAN (hex bytes)
28
Encoding: MAC_TURKISH (hex bytes)
28
Encoding: PTCP154 (hex bytes)
28
Encoding: SHIFT_JIS (hex bytes)
28
Encoding: SHIFT_JIS_2004 (hex bytes)
28
Encoding: SHIFT_JISX0213 (hex bytes)
28
Encoding: CP037 (hex bytes)
4D
Encoding: CP1025 (hex bytes)
4D
Encoding: CP1047 (hex bytes)
4D
Encoding: CP1097 (hex bytes)
4D
Encoding: CP1112 (hex bytes)
4D
Encoding: CP1122 (hex bytes)
4D
Encoding: CP1123 (hex bytes)
4D
Encoding: CP1140 (hex bytes)
4D
Encoding: CP1141 (hex bytes)
4D
Encoding: CP1142 (hex bytes)
4D
Encoding: CP1143 (hex bytes)
4D
Encoding: CP1144 (hex bytes)
4D
Encoding: CP1145 (hex bytes)
4D
Encoding: CP1146 (hex bytes)
4D
Encoding: CP1147 (hex bytes)
4D
Encoding: CP1148 (hex bytes)
4D
Encoding: CP1148MS (hex bytes)
4D
Encoding: CP1149 (hex bytes)
4D
Encoding: CP273 (hex bytes)
4D
Encoding: CP277 (hex bytes)
4D
Encoding: CP278 (hex bytes)
4D
Encoding: CP280 (hex bytes)
4D
Encoding: CP284 (hex bytes)
4D
Encoding: CP285 (hex bytes)
4D
Encoding: CP290 (hex bytes)
4D
Encoding: CP297 (hex bytes)
4D
Encoding: CP420 (hex bytes)
4D
Encoding: CP424 (hex bytes)
4D
Encoding: CP500 (hex bytes)
4D
Encoding: CP500MS (hex bytes)
4D
Encoding: CP833 (hex bytes)
4D
Encoding: CP838 (hex bytes)
4D
Encoding: CP870 (hex bytes)
4D
Encoding: CP871 (hex bytes)
4D
Encoding: CP875 (hex bytes)
4D
AGL: Latin-1
parenleft
AGL: Latin-2
parenleft
AGL: Latin-3
parenleft
AGL: Latin-4
parenleft
AGL: Latin-5
parenleft
Adobe Glyph List
parenleft
digraph
(
RFC 5137
\u'0028'
Bash and Zsh inside echo -e
\u0028
C and C++
\u0028
C#
\u0028
CSS
\000028
Excel
=UNICHAR(40)
Go
\u0028
JavaScript
\u0028
Modern JavaScript since ES6
\u{28}
JSON
\u0028
Java
\u0028
Lua
\u{28}
Matlab
char(40)
Perl
"\x{28}"
PHP
\u{28}
PostgreSQL
U&'\0028'
PowerShell
`u{28}
Python
\u0028
Ruby
\u{28}
Rust
\u{28}
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