This character is a Nonspacing Mark and inherits its script property from the preceding character. It is also used in the scripts Duployan shorthand, Latin, Syriac.
The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it acts as Nonspacing Mark. When changing direction it is not mirrored. U+030A prohibits a line break before it. The glyph can be confused with 19 other glyphs.
The Wikipedia has the following information about this codepoint:
A ring diacritic may appear above or below letters. It may be combined with some letters of the extended Latin alphabets in various contexts.
Representations
System
Representation (click value to copy)
Nº
778
UTF-8
CC 8A
UTF-16
03 0A
UTF-32
00 00 03 0A
URL-Quoted
%CC%8A
HTML hex reference
̊
Wrong windows-1252 Mojibake
◌̊
Encoding: GB18030 (hex bytes)
81 30 BD 36
LATEX
\r
AGL: Latin-4
uni030A
AGL: Latin-5
uni030A
Adobe Glyph List
ringcmb
RFC 5137
\u'030A'
Bash and Zsh inside echo -e
\u030A
C and C++
\u030A
C#
\u030A
CSS
\00030A
Excel
=UNICHAR(778)
Go
\u030A
JavaScript
\u030A
Modern JavaScript since ES6
\u{30a}
JSON
\u030A
Java
\u030A
Lua
\u{30A}
Matlab
char(778)
Perl
"\x{30A}"
PHP
\u{30a}
PostgreSQL
U&'\030A'
PowerShell
`u{30A}
Python
\u030A
Ruby
\u{30a}
Rust
\u{30a}
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