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+12155 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The cuneiform ir (more common usage), or er sign is a sign used in the Epic of Gilgamesh, and the Amarna letters. It is in a small group that have smaller, 3-verticals, as well as 2- and 1-vertical strokes, sitting on a lower horizontal cuneiform stroke.
The sign is similar to the sa (cuneiform) sign, but sa's upper horizontal stroke is shorter than the lower anchored horizontal stroke. In the Amarna letters, it can also be confused with specific usages of ΓΊ-(the alphabetic u (by usage), Γ-1st primeβΓ-2nd prime is a complex, two-part large cuneiform sign, ="and", "but", or other conjunction meanings), as in Amarna letter EA 362, (Biridiya to Pharaoh).
Representations
System
Representation (click value to copy)
NΒΊ
74069
UTF-8
F0 92 85 95
UTF-16
D8 08 DD 55
UTF-32
00 01 21 55
URL-Quoted
%F0%92%85%95
HTML hex reference
𒅕
Wrong windows-1252 Mojibake
Γ°ββ¦β’
Encoding: GB18030 (hex bytes)
90 36 E2 33
RFC 5137
\u'12155'
Bash and Zsh inside echo -e
\U00012155
C and C++
\U00012155
C#
\U00012155
CSS
\012155
Excel
=UNICHAR(74069)
Go
\U00012155
JavaScript
\uD808\uDD55
Modern JavaScript since ES6
\u{12155}
JSON
\uD808\uDD55
Java
\uD808\uDD55
Lua
\u{12155}
Matlab
char(74069)
Perl
"\x{12155}"
PHP
\u{12155}
PostgreSQL
U&'\+012155'
PowerShell
`u{12155}
Python
\U00012155
Ruby
\u{12155}
Rust
\u{12155}
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