This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as flag.
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+1F3F3 offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “white flag” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: flag, waving, white.
This character is designated as an emoji. It will be rendered as monochrome character on conforming platforms. To enable colorful emoji display, you can combine it with Variation Selector-16: 🏳️ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
White flags have had different meanings throughout history and depending on the locale.
Representations
System
Representation (click value to copy)
Nº
127987
UTF-8
F0 9F 8F B3
UTF-16
D8 3C DF F3
UTF-32
00 01 F3 F3
URL-Quoted
%F0%9F%8F%B3
HTML hex reference
🏳
Wrong windows-1252 Mojibake
ðŸ³
alias
flag
Encoding: GB18030 (hex bytes)
94 39 C8 31
RFC 5137
\u'1F3F3'
Bash and Zsh inside echo -e
\U0001F3F3
C and C++
\U0001F3F3
C#
\U0001F3F3
CSS
\01F3F3
Excel
=UNICHAR(127987)
Go
\U0001F3F3
JavaScript
\uD83C\uDFF3
Modern JavaScript since ES6
\u{1f3f3}
JSON
\uD83C\uDFF3
Java
\uD83C\uDFF3
Lua
\u{1F3F3}
Matlab
char(127987)
Perl
"\x{1F3F3}"
PHP
\u{1f3f3}
PostgreSQL
U&'\+01F3F3'
PowerShell
`u{1F3F3}
Python
\U0001F3F3
Ruby
\u{1f3f3}
Rust
\u{1f3f3}
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