This character is a Math Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written as end of a European number, e.g., a currency symbol, from left to right. When changing direction it is not mirrored. U+2213 prohibits a line break after it, if it is followed by a number.
The CLDR project calls this character “minus-or-plus” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: plus-minus.
The Wikipedia has the following information about this codepoint:
The plus–minus sign or plus-or-minus sign, ±, is a symbol with multiple meanings.
In mathematics, it generally indicates a choice of exactly two possible values, one of which is obtained through addition and the other through subtraction.
In statistics and experimental sciences, the sign commonly indicates the confidence interval or uncertainty bounding a range of possible errors in a measurement, often the standard deviation or standard error. The sign may also represent an inclusive range of values that a reading might have.
In chess, the sign indicates a clear advantage for the white player; the complementary minus-plus sign, ∓ indicates the same advantage for the black player.
Other meanings occur in other fields, including medicine, engineering, chemistry, electronics, linguistics, and philosophy.
Representations
System
Representation (click value to copy)
Nº
8723
UTF-8
E2 88 93
UTF-16
22 13
UTF-32
00 00 22 13
URL-Quoted
%E2%88%93
HTML hex reference
∓
Wrong windows-1252 Mojibake
∓
HTML named entity
∓
HTML named entity
∓
HTML named entity
∓
Encoding: EUC_JIS_2004 (hex bytes)
A3 DB
Encoding: EUC_JISX0213 (hex bytes)
A3 DB
Encoding: GB18030 (hex bytes)
81 36 D3 32
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 23 5B 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 23 5B 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)
82 7A
Encoding: SHIFT_JISX0213 (hex bytes)
82 7A
LATEX
\mp
Adobe Glyph List
minusplus
digraph
-+
RFC 5137
\u'2213'
Bash and Zsh inside echo -e
\u2213
C and C++
\u2213
C#
\u2213
CSS
\002213
Excel
=UNICHAR(8723)
Go
\u2213
JavaScript
\u2213
Modern JavaScript since ES6
\u{2213}
JSON
\u2213
Java
\u2213
Lua
\u{2213}
Matlab
char(8723)
Perl
"\x{2213}"
PHP
\u{2213}
PostgreSQL
U&'\2213'
PowerShell
`u{2213}
Python
\u2213
Ruby
\u{2213}
Rust
\u{2213}
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