This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+1F409 offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “dragon” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: animal, fairy, fairytale, knights, tale.
This character is designated as an emoji. It will be rendered as colorful emoji on conforming platforms. To reduce it to a monochrome character, you can combine it with Variation Selector-15: 🐉︎ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
A dragon is a magical legendary creature that appears in the folklore of multiple cultures worldwide. Beliefs about dragons vary considerably through regions, but dragons in Western cultures since the High Middle Ages have often been depicted as winged, horned, and capable of breathing fire. Dragons in eastern cultures are usually depicted as wingless, four-legged, serpentine creatures with above-average intelligence. Commonalities between dragons' traits are often a hybridization of feline, reptilian, mammalian, and avian features.
Representations
System
Representation (click value to copy)
Nº
128009
UTF-8
F0 9F 90 89
UTF-16
D8 3D DC 09
UTF-32
00 01 F4 09
URL-Quoted
%F0%9F%90%89
HTML hex reference
🐉
Wrong windows-1252 Mojibake
ðŸ‰
Encoding: GB18030 (hex bytes)
94 39 CA 33
RFC 5137
\u'1F409'
Bash and Zsh inside echo -e
\U0001F409
C and C++
\U0001F409
C#
\U0001F409
CSS
\01F409
Excel
=UNICHAR(128009)
Go
\U0001F409
JavaScript
\uD83D\uDC09
Modern JavaScript since ES6
\u{1f409}
JSON
\uD83D\uDC09
Java
\uD83D\uDC09
Lua
\u{1F409}
Matlab
char(128009)
Perl
"\x{1F409}"
PHP
\u{1f409}
PostgreSQL
U&'\+01F409'
PowerShell
`u{1F409}
Python
\U0001F409
Ruby
\u{1f409}
Rust
\u{1f409}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)