This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as classified.
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+1F5DF offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
An annotation is extra information associated with a particular point in a document or other piece of information. It can be a note that includes a comment or explanation. Annotations are sometimes presented in the margin of book pages. For annotations of different digital media, see web annotation and text annotation.
Five types of annotation are given LIDAR annotation, Image annotation, Text annotation, Video annotation, Audio annotation
Representations
System
Representation (click value to copy)
NΒΊ
128479
UTF-8
F0 9F 97 9F
UTF-16
D8 3D DD DF
UTF-32
00 01 F5 DF
URL-Quoted
%F0%9F%97%9F
HTML hex reference
🗟
Wrong windows-1252 Mojibake
Γ°ΕΈβΕΈ
alias
classified
Encoding: GB18030 (hex bytes)
94 39 F9 33
RFC 5137
\u'1F5DF'
Bash and Zsh inside echo -e
\U0001F5DF
C and C++
\U0001F5DF
C#
\U0001F5DF
CSS
\01F5DF
Excel
=UNICHAR(128479)
Go
\U0001F5DF
JavaScript
\uD83D\uDDDF
Modern JavaScript since ES6
\u{1f5df}
JSON
\uD83D\uDDDF
Java
\uD83D\uDDDF
Lua
\u{1F5DF}
Matlab
char(128479)
Perl
"\x{1F5DF}"
PHP
\u{1f5df}
PostgreSQL
U&'\+01F5DF'
PowerShell
`u{1F5DF}
Python
\U0001F5DF
Ruby
\u{1f5df}
Rust
\u{1f5df}
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