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+12146 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The cuneiform sign Ε‘i, lim, and Sumerogram IGI is a common-use sign of the Amarna letters, the Epic of Gilgamesh, and other cuneiform texts. As the syllabic form it is commonly used for Ε‘i, lim/lem, and for Sumerograms (capital letter majuscules), it is most commonly used for IGI (Akkadian language pΔnu, for English language "face", "presence"), and (with prep.) "before". Also, for Ε‘i and lim/lem it can be used syllabically for Ε‘, i, l, i/e, and m, in the spelling of words.
Representations
System
Representation (click value to copy)
NΒΊ
74054
UTF-8
F0 92 85 86
UTF-16
D8 08 DD 46
UTF-32
00 01 21 46
URL-Quoted
%F0%92%85%86
HTML hex reference
𒅆
Wrong windows-1252 Mojibake
Γ°ββ¦β
Encoding: GB18030 (hex bytes)
90 36 E0 38
RFC 5137
\u'12146'
Bash and Zsh inside echo -e
\U00012146
C and C++
\U00012146
C#
\U00012146
CSS
\012146
Excel
=UNICHAR(74054)
Go
\U00012146
JavaScript
\uD808\uDD46
Modern JavaScript since ES6
\u{12146}
JSON
\uD808\uDD46
Java
\uD808\uDD46
Lua
\u{12146}
Matlab
char(74054)
Perl
"\x{12146}"
PHP
\u{12146}
PostgreSQL
U&'\+012146'
PowerShell
`u{12146}
Python
\U00012146
Ruby
\u{12146}
Rust
\u{12146}
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