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+10181 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
A metretes was an ancient Greek unit of liquid measurement, equivalent to 39.3 liters.
Representations
System
Representation (click value to copy)
NΒΊ
65921
UTF-8
F0 90 86 81
UTF-16
D8 00 DD 81
UTF-32
00 01 01 81
URL-Quoted
%F0%90%86%81
HTML hex reference
𐆁
Wrong windows-1252 Mojibake
Γ°Ββ Β
Encoding: GB18030 (hex bytes)
90 30 A7 35
RFC 5137
\u'10181'
Bash and Zsh inside echo -e
\U00010181
C and C++
\U00010181
C#
\U00010181
CSS
\010181
Excel
=UNICHAR(65921)
Go
\U00010181
JavaScript
\uD800\uDD81
Modern JavaScript since ES6
\u{10181}
JSON
\uD800\uDD81
Java
\uD800\uDD81
Lua
\u{10181}
Matlab
char(65921)
Perl
"\x{10181}"
PHP
\u{10181}
PostgreSQL
U&'\+010181'
PowerShell
`u{10181}
Python
\U00010181
Ruby
\u{10181}
Rust
\u{10181}
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