This character is a Other Symbol and is commonly used, that is, in no specific script.
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. The word that U+2691 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
This is a list of flags which are entirely or largely black.
Representations
System
Representation (click value to copy)
Nº
9873
UTF-8
E2 9A 91
UTF-16
26 91
UTF-32
00 00 26 91
URL-Quoted
%E2%9A%91
HTML hex reference
⚑
Wrong windows-1252 Mojibake
âš‘
Encoding: GB18030 (hex bytes)
81 37 B0 37
RFC 5137
\u'2691'
Bash and Zsh inside echo -e
\u2691
C and C++
\u2691
C#
\u2691
CSS
\002691
Excel
=UNICHAR(9873)
Go
\u2691
JavaScript
\u2691
Modern JavaScript since ES6
\u{2691}
JSON
\u2691
Java
\u2691
Lua
\u{2691}
Matlab
char(9873)
Perl
"\x{2691}"
PHP
\u{2691}
PostgreSQL
U&'\2691'
PowerShell
`u{2691}
Python
\u2691
Ruby
\u{2691}
Rust
\u{2691}
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