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+2380 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Insert keyInsert (often abbreviated Ins) is a key commonly found on computer keyboards.
It is primarily used to switch between the two text-entering modes on a personal computer (PC) or word processor:
overtype mode, in which the cursor, when typing, overwrites any text that is present in the current location; and
insert mode, where the cursor inserts a character at its current position, forcing all characters past it one position further.
The insert/overtype mode toggling is not global for the computer or even for a single application but rather local to the text input window in which the Insert key was pressed.
Representations
System
Representation (click value to copy)
Nº
9088
UTF-8
E2 8E 80
UTF-16
23 80
UTF-32
00 00 23 80
URL-Quoted
%E2%8E%80
HTML hex reference
⎀
Wrong windows-1252 Mojibake
⎀
Encoding: GB18030 (hex bytes)
81 36 F4 32
RFC 5137
\u'2380'
Bash and Zsh inside echo -e
\u2380
C and C++
\u2380
C#
\u2380
CSS
\002380
Excel
=UNICHAR(9088)
Go
\u2380
JavaScript
\u2380
Modern JavaScript since ES6
\u{2380}
JSON
\u2380
Java
\u2380
Lua
\u{2380}
Matlab
char(9088)
Perl
"\x{2380}"
PHP
\u{2380}
PostgreSQL
U&'\2380'
PowerShell
`u{2380}
Python
\u2380
Ruby
\u{2380}
Rust
\u{2380}
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