This character is a Other Symbol and is mainly used in the Greek 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+1D245 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Ancient Greek Musical Notation is a Unicode block containing symbols representing musical notations used in ancient Greece.
Representations
System
Representation (click value to copy)
NΒΊ
119365
UTF-8
F0 9D 89 85
UTF-16
D8 34 DE 45
UTF-32
00 01 D2 45
URL-Quoted
%F0%9D%89%85
HTML hex reference
𝉅
Wrong windows-1252 Mojibake
Γ°Ββ°β¦
Encoding: GB18030 (hex bytes)
94 32 DB 39
RFC 5137
\u'1D245'
Bash and Zsh inside echo -e
\U0001D245
C and C++
\U0001D245
C#
\U0001D245
CSS
\01D245
Excel
=UNICHAR(119365)
Go
\U0001D245
JavaScript
\uD834\uDE45
Modern JavaScript since ES6
\u{1d245}
JSON
\uD834\uDE45
Java
\uD834\uDE45
Lua
\u{1D245}
Matlab
char(119365)
Perl
"\x{1D245}"
PHP
\u{1d245}
PostgreSQL
U&'\+01D245'
PowerShell
`u{1D245}
Python
\U0001D245
Ruby
\u{1d245}
Rust
\u{1d245}
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