This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as recipe and cross ratio.
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+211E forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
A prescription, often abbreviated ℞ or Rx, is a formal communication from a physician or other registered healthcare professional to a pharmacist, authorizing them to dispense a specific prescription drug for a specific patient. Historically, it was a physician's instruction to an apothecary listing the materials to be compounded into a treatment—the symbol ℞ (a capital letter R, crossed to indicate abbreviation) comes from the first word of a medieval prescription, Latin recipe (lit.'take thou'), that gave the list of the materials to be compounded.
Representations
System
Representation (click value to copy)
Nº
8478
UTF-8
E2 84 9E
UTF-16
21 1E
UTF-32
00 00 21 1E
URL-Quoted
%E2%84%9E
HTML hex reference
℞
Wrong windows-1252 Mojibake
â„ž
HTML named entity
℞
alias
recipe
alias
cross ratio
Encoding: GB18030 (hex bytes)
81 36 BE 31
LATEX
\Elzxrat
AGL: Latin-5
prescription
Adobe Glyph List
prescription
digraph
Rx
RFC 5137
\u'211E'
Bash and Zsh inside echo -e
\u211E
C and C++
\u211E
C#
\u211E
CSS
\00211E
Excel
=UNICHAR(8478)
Go
\u211E
JavaScript
\u211E
Modern JavaScript since ES6
\u{211e}
JSON
\u211E
Java
\u211E
Lua
\u{211E}
Matlab
char(8478)
Perl
"\x{211E}"
PHP
\u{211e}
PostgreSQL
U&'\211E'
PowerShell
`u{211E}
Python
\u211E
Ruby
\u{211e}
Rust
\u{211e}
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