This character is a Other Symbol 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. The word that U+2418 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In telecommunications and character encoding, the term cancel character refers to a control character which may be either of:
"CAN", "Cancel", U+0018, or ^X used to indicate that the data with which it is associated are in error or are to be disregarded. Exact meaning can depend on protocol. For example:
In some journalistic text transmission formats, it signifies that the preceding word should be deleted; it is sometimes called "Kill Word" ("KW") in this context.
In some Videotex formats, it stops any running macros. In others, it clears the current line after the cursor position (compare EL).
"CCH", "Cancel Character", U+0094, or ESC T used to erase the previous character. This character was created as an unambiguous alternative to the much more common backspace character ("BS", U+0008), which has a now mostly obsolete alternative function of causing the following character to be superimposed on the preceding one.
Representations
System
Representation (click value to copy)
Nº
9240
UTF-8
E2 90 98
UTF-16
24 18
UTF-32
00 00 24 18
URL-Quoted
%E2%90%98
HTML hex reference
␘
Wrong windows-1252 Mojibake
â˜
Encoding: GB18030 (hex bytes)
81 37 85 34
RFC 5137
\u'2418'
Bash and Zsh inside echo -e
\u2418
C and C++
\u2418
C#
\u2418
CSS
\002418
Excel
=UNICHAR(9240)
Go
\u2418
JavaScript
\u2418
Modern JavaScript since ES6
\u{2418}
JSON
\u2418
Java
\u2418
Lua
\u{2418}
Matlab
char(9240)
Perl
"\x{2418}"
PHP
\u{2418}
PostgreSQL
U&'\2418'
PowerShell
`u{2418}
Python
\u2418
Ruby
\u{2418}
Rust
\u{2418}
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