This character is a Dash Punctuation 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. U+2E40 offers a line break opportunity after its position. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
In Latin script, the double hyphen⹀ is a punctuation mark that consists of two parallel hyphens (‐). It was a development of the earlier double oblique hyphen⸗, which developed from a Central European variant of the virgule slash, originally a form of scratch comma. Similar marks (see below) are used in other scripts.
In order to avoid it being confused with the equals sign =, the double hyphen is often shown as a double oblique hyphen in modern typography. The double hyphen is also not to be confused with two consecutive hyphens (--), which are often used to represent an em dash — or en dash – due to the limitations of typewriters and keyboards that do not have distinct hyphen and dash keys.
Representations
System
Representation (click value to copy)
Nº
11840
UTF-8
E2 B9 80
UTF-16
2E 40
UTF-32
00 00 2E 40
URL-Quoted
%E2%B9%80
HTML hex reference
⹀
Wrong windows-1252 Mojibake
â¹€
Encoding: GB18030 (hex bytes)
81 38 F7 34
RFC 5137
\u'2E40'
Bash and Zsh inside echo -e
\u2E40
C and C++
\u2E40
C#
\u2E40
CSS
\002E40
Excel
=UNICHAR(11840)
Go
\u2E40
JavaScript
\u2E40
Modern JavaScript since ES6
\u{2e40}
JSON
\u2E40
Java
\u2E40
Lua
\u{2E40}
Matlab
char(11840)
Perl
"\x{2E40}"
PHP
\u{2e40}
PostgreSQL
U&'\2E40'
PowerShell
`u{2E40}
Python
\u2E40
Ruby
\u{2e40}
Rust
\u{2e40}
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