This character is a Connector Punctuation and is commonly used, that is, in no specific script. The character is also known as z notation sequence concatenation.
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+2040 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The tie is a symbol in the shape of an arc similar to a large breve, used in Greek, phonetic alphabets, and Z notation. It can be used between two characters with spacing as punctuation, non-spacing as a diacritic, or (underneath) as a proofreading mark. It can be above or below, and reversed. Its forms are called tie, double breve, enotikon or papyrological hyphen, ligature tie, and undertie.
Representations
System
Representation (click value to copy)
Nº
8256
UTF-8
E2 81 80
UTF-16
20 40
UTF-32
00 00 20 40
URL-Quoted
%E2%81%80
HTML hex reference
⁀
Wrong windows-1252 Mojibake
â€
alias
z notation sequence concatenation
Encoding: GB18030 (hex bytes)
81 36 A8 34
RFC 5137
\u'2040'
Bash and Zsh inside echo -e
\u2040
C and C++
\u2040
C#
\u2040
CSS
\002040
Excel
=UNICHAR(8256)
Go
\u2040
JavaScript
\u2040
Modern JavaScript since ES6
\u{2040}
JSON
\u2040
Java
\u2040
Lua
\u{2040}
Matlab
char(8256)
Perl
"\x{2040}"
PHP
\u{2040}
PostgreSQL
U&'\2040'
PowerShell
`u{2040}
Python
\u2040
Ruby
\u{2040}
Rust
\u{2040}
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