This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as clone.
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+2104 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies.
Technical standards exist to provide glossaries of abbreviations, acronyms, and symbols that may be found on engineering drawings. Many corporations have such standards, which define some terms and symbols specific to them; on the national and international level, ASME standard Y14.38 is one of the standards.
Australia utilises the Technical Drawing standards AS1100.101 (General Principals), AS1100-201 (Mechanical Engineering Drawing) and AS1100-301 (Structural Engineering Drawing).
Representations
System
Representation (click value to copy)
Nº
8452
UTF-8
E2 84 84
UTF-16
21 04
UTF-32
00 00 21 04
URL-Quoted
%E2%84%84
HTML hex reference
℄
Wrong windows-1252 Mojibake
â„„
alias
clone
Encoding: GB18030 (hex bytes)
81 36 BB 38
RFC 5137
\u'2104'
Bash and Zsh inside echo -e
\u2104
C and C++
\u2104
C#
\u2104
CSS
\002104
Excel
=UNICHAR(8452)
Go
\u2104
JavaScript
\u2104
Modern JavaScript since ES6
\u{2104}
JSON
\u2104
Java
\u2104
Lua
\u{2104}
Matlab
char(8452)
Perl
"\x{2104}"
PHP
\u{2104}
PostgreSQL
U&'\2104'
PowerShell
`u{2104}
Python
\u2104
Ruby
\u{2104}
Rust
\u{2104}
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