This character is a Format and is commonly used, that is, in no specific script. The character is also known as invisible comma.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Boundary Neutral. When changing direction it is not mirrored. The word that U+2063 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In mathematics and computer programming, index notation is used to specify the elements of an array of numbers. The formalism of how indices are used varies according to the subject. In particular, there are different methods for referring to the elements of a list, a vector, or a matrix, depending on whether one is writing a formal mathematical paper for publication, or when one is writing a computer program.
Representations
System
Representation (click value to copy)
Nº
8291
UTF-8
E2 81 A3
UTF-16
20 63
UTF-32
00 00 20 63
URL-Quoted
%E2%81%A3
HTML hex reference
⁣
Wrong windows-1252 Mojibake
â£
HTML named entity
⁣
HTML named entity
⁣
alias
invisible comma
Encoding: GB18030 (hex bytes)
81 36 AB 39
RFC 5137
\u'2063'
Bash and Zsh inside echo -e
\u2063
C and C++
\u2063
C#
\u2063
CSS
\002063
Excel
=UNICHAR(8291)
Go
\u2063
JavaScript
\u2063
Modern JavaScript since ES6
\u{2063}
JSON
\u2063
Java
\u2063
Lua
\u{2063}
Matlab
char(8291)
Perl
"\x{2063}"
PHP
\u{2063}
PostgreSQL
U&'\2063'
PowerShell
`u{2063}
Python
\u2063
Ruby
\u{2063}
Rust
\u{2063}
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