This character is a Other Punctuation and is commonly used, that is, in no specific script. The character is also known as gnaborretni.
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+2E18 prohibits a line break after it.
The Wikipedia has the following information about this codepoint:
The interrobang (), also known as the interabang‽ (often represented by any of the following: ?!, !?, ?!?,?!!, !?? or !?!), is an unconventional punctuation mark intended to combine the functions of the question mark (also known as the interrogative point) and the exclamation mark (also known in the jargon of printers and programmers as a "bang"). The glyph is a ligature of these two marks and was first proposed in 1962 by Martin K. Speckter.
Representations
System
Representation (click value to copy)
Nº
11800
UTF-8
E2 B8 98
UTF-16
2E 18
UTF-32
00 00 2E 18
URL-Quoted
%E2%B8%98
HTML hex reference
⸘
Wrong windows-1252 Mojibake
⸘
alias
gnaborretni
Encoding: GB18030 (hex bytes)
81 38 F3 34
RFC 5137
\u'2E18'
Bash and Zsh inside echo -e
\u2E18
C and C++
\u2E18
C#
\u2E18
CSS
\002E18
Excel
=UNICHAR(11800)
Go
\u2E18
JavaScript
\u2E18
Modern JavaScript since ES6
\u{2e18}
JSON
\u2E18
Java
\u2E18
Lua
\u{2E18}
Matlab
char(11800)
Perl
"\x{2E18}"
PHP
\u{2e18}
PostgreSQL
U&'\2E18'
PowerShell
`u{2E18}
Python
\u2E18
Ruby
\u{2e18}
Rust
\u{2e18}
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