This character is a Other Number and is mainly used in the Greek script. The codepoint has the numeric value 0.
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+1018A forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Greek numerals, also known as Ionic, Ionian, Milesian, or Alexandrian numerals, is a system of writing numbers using the letters of the Greek alphabet. In modern Greece, they are still used for ordinal numbers and in contexts similar to those in which Roman numerals are still used in the Western world. For ordinary cardinal numbers, however, modern Greece uses Arabic numerals.
Representations
System
Representation (click value to copy)
NΒΊ
65930
UTF-8
F0 90 86 8A
UTF-16
D8 00 DD 8A
UTF-32
00 01 01 8A
URL-Quoted
%F0%90%86%8A
HTML hex reference
𐆊
Wrong windows-1252 Mojibake
Γ°Ββ Ε
Encoding: GB18030 (hex bytes)
90 30 A8 34
RFC 5137
\u'1018A'
Bash and Zsh inside echo -e
\U0001018A
C and C++
\U0001018A
C#
\U0001018A
CSS
\01018A
Excel
=UNICHAR(65930)
Go
\U0001018A
JavaScript
\uD800\uDD8A
Modern JavaScript since ES6
\u{1018a}
JSON
\uD800\uDD8A
Java
\uD800\uDD8A
Lua
\u{1018A}
Matlab
char(65930)
Perl
"\x{1018A}"
PHP
\u{1018a}
PostgreSQL
U&'\+01018A'
PowerShell
`u{1018A}
Python
\U0001018A
Ruby
\u{1018a}
Rust
\u{1018a}
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