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+1F420 offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “tropical fish” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: animal, fish, fishes, tropical.
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:
Tropical fish are fish found in aquatic tropical environments around the world. Fishkeepers often keep tropical fish in freshwater and saltwater aquariums. The term "tropical fish" is not a taxonomic group, but rather is a general term for fish found in such environments, particularly those kept in aquariums.
Representations
System
Representation (click value to copy)
Nº
128032
UTF-8
F0 9F 90 A0
UTF-16
D8 3D DC 20
UTF-32
00 01 F4 20
URL-Quoted
%F0%9F%90%A0
HTML hex reference
🐠
Wrong windows-1252 Mojibake
ðŸ
Encoding: GB18030 (hex bytes)
94 39 CC 36
RFC 5137
\u'1F420'
Bash and Zsh inside echo -e
\U0001F420
C and C++
\U0001F420
C#
\U0001F420
CSS
\01F420
Excel
=UNICHAR(128032)
Go
\U0001F420
JavaScript
\uD83D\uDC20
Modern JavaScript since ES6
\u{1f420}
JSON
\uD83D\uDC20
Java
\uD83D\uDC20
Lua
\u{1F420}
Matlab
char(128032)
Perl
"\x{1F420}"
PHP
\u{1f420}
PostgreSQL
U&'\+01F420'
PowerShell
`u{1F420}
Python
\U0001F420
Ruby
\u{1f420}
Rust
\u{1f420}
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