This character is a Other 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 acts as Other Neutral. When changing direction it is not mirrored. The word that U+211F forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In Christian liturgical worship, Preces (Latin for 'prayers'; PREE-seez), also known in Anglican prayer as the Suffrages or Responses, describe a series of short petitions said or sung as versicles and responses by the officiant and congregation respectively. Versicle-and-response is one of the oldest forms of prayer in Christianity, with its roots in Hebrew prayer during the time of the Temple in Jerusalem. In many prayer books the versicles and responses comprising the Preces are denoted by special glyphs:
Versicle: ℣, a letter V crossed by an oblique line — Unicode 2123, HTML entity ℣
Response: ℟, a letter R crossed by an oblique line — Unicode 211F, HTML entity ℟
Representations
System
Representation (click value to copy)
Nº
8479
UTF-8
E2 84 9F
UTF-16
21 1F
UTF-32
00 00 21 1F
URL-Quoted
%E2%84%9F
HTML hex reference
℟
Wrong windows-1252 Mojibake
â„Ÿ
Encoding: GB18030 (hex bytes)
81 36 BE 32
RFC 5137
\u'211F'
Bash and Zsh inside echo -e
\u211F
C and C++
\u211F
C#
\u211F
CSS
\00211F
Excel
=UNICHAR(8479)
Go
\u211F
JavaScript
\u211F
Modern JavaScript since ES6
\u{211f}
JSON
\u211F
Java
\u211F
Lua
\u{211F}
Matlab
char(8479)
Perl
"\x{211F}"
PHP
\u{211f}
PostgreSQL
U&'\211F'
PowerShell
`u{211F}
Python
\u211F
Ruby
\u{211f}
Rust
\u{211f}
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