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+1F4AD offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “thought balloon” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: balloon, bubble, cartoon, cloud, comic, daydream, decisions, dream, idea, invent, invention, realize, think, thoughts, wonder.
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 Glyph for U+FE0EVariation Selector-15: 💭︎ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
Speech balloons (also speech bubbles, dialogue balloons, or word balloons) are a graphic convention used most commonly in comic books, comics, and cartoons to allow words (and much less often, pictures) to be understood as representing a character's speech or thoughts. A formal distinction is often made between the balloon that indicates speech and the one that indicates thoughts; the balloon that conveys thoughts is often referred to as a thought bubble or conversation cloud.
Representations
System
Representation (click value to copy)
Nº
128173
UTF-8
F0 9F 92 AD
UTF-16
D8 3D DC AD
UTF-32
00 01 F4 AD
URL-Quoted
%F0%9F%92%AD
HTML hex reference
💭
Wrong windows-1252 Mojibake
ðŸ’
Encoding: GB18030 (hex bytes)
94 39 DA 37
RFC 5137
\u'1F4AD'
Bash and Zsh inside echo -e
\U0001F4AD
C and C++
\U0001F4AD
C#
\U0001F4AD
CSS
\01F4AD
Excel
=UNICHAR(128173)
Go
\U0001F4AD
JavaScript
\uD83D\uDCAD
Modern JavaScript since ES6
\u{1f4ad}
JSON
\uD83D\uDCAD
Java
\uD83D\uDCAD
Lua
\u{1F4AD}
Matlab
char(128173)
Perl
"\x{1F4AD}"
PHP
\u{1f4ad}
PostgreSQL
U&'\+01F4AD'
PowerShell
`u{1F4AD}
Python
\U0001F4AD
Ruby
\u{1f4ad}
Rust
\u{1f4ad}
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