This character is a Other Letter and is mainly used in the Cuneiform script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+12309 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The cuneiform sign for tur is used to denote one syllabic usage, tur, or the sign's Sumerograms; it is used in the Epic of Gilgamesh and the 14th century BC Amarna letters. The sign is based on the i (cuneiform) sign, with the one small added vertical stroke.
Besides tur, it is for Sumerograms (logograms) BΓN, DUMU, and TUR. In the Epic of Gilgamesh, it is used in the following numbers: tur-(11 times), BΓN-(3), DUMU-(25), TUR-(2). The large usage of DUMU in the Epic is for the Sumerogram being the equivalent of "son", Akkadian language "mΔru".
Representations
System
Representation (click value to copy)
NΒΊ
74505
UTF-8
F0 92 8C 89
UTF-16
D8 08 DF 09
UTF-32
00 01 23 09
URL-Quoted
%F0%92%8C%89
HTML hex reference
𒌉
Wrong windows-1252 Mojibake
Γ°βΕβ°
Encoding: GB18030 (hex bytes)
90 37 8F 39
RFC 5137
\u'12309'
Bash and Zsh inside echo -e
\U00012309
C and C++
\U00012309
C#
\U00012309
CSS
\012309
Excel
=UNICHAR(74505)
Go
\U00012309
JavaScript
\uD808\uDF09
Modern JavaScript since ES6
\u{12309}
JSON
\uD808\uDF09
Java
\uD808\uDF09
Lua
\u{12309}
Matlab
char(74505)
Perl
"\x{12309}"
PHP
\u{12309}
PostgreSQL
U&'\+012309'
PowerShell
`u{12309}
Python
\U00012309
Ruby
\u{12309}
Rust
\u{12309}
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