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+2740 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
A fleuron (), also known as printers' flower, is a typographic element, or glyph, used either as a punctuation mark or as an ornament for typographic compositions. Fleurons are stylized forms of flowers or leaves; the term derives from the Old French: floron ("flower"). Robert Bringhurst in The Elements of Typographic Style calls the forms "horticultural dingbats". A commonly encountered fleuron is the ❦, the floral heart or hedera (ivy leaf). It is also known as an aldus leaf (after Italian Renaissance printer Aldus Manutius).
Representations
System
Representation (click value to copy)
Nº
10048
UTF-8
E2 9D 80
UTF-16
27 40
UTF-32
00 00 27 40
URL-Quoted
%E2%9D%80
HTML hex reference
❀
Wrong windows-1252 Mojibake
â€
Encoding: GB18030 (hex bytes)
81 37 C2 32
LATEX
\ding{96}
RFC 5137
\u'2740'
Bash and Zsh inside echo -e
\u2740
C and C++
\u2740
C#
\u2740
CSS
\002740
Excel
=UNICHAR(10048)
Go
\u2740
JavaScript
\u2740
Modern JavaScript since ES6
\u{2740}
JSON
\u2740
Java
\u2740
Lua
\u{2740}
Matlab
char(10048)
Perl
"\x{2740}"
PHP
\u{2740}
PostgreSQL
U&'\2740'
PowerShell
`u{2740}
Python
\u2740
Ruby
\u{2740}
Rust
\u{2740}
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