This character is a Other Letter and is mainly used in the Bopomofo script.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+31A5 offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
Bopomofo, also called Zhuyin Fuhao (注音符號; Zhùyīn fúhào; 'phonetic symbols'), or simply Zhuyin, is a transliteration system for Standard Chinese and other Sinitic languages. It is commonly used in Taiwan. It consists of 37 characters and five tone marks, which together can transcribe all possible sounds in Mandarin Chinese.
Bopomofo was first introduced in China during the 1910s by the Beiyang government, where it was used alongside Wade–Giles, a romanization system which used a modified Latin alphabet. Today, Bopomofo is more common in Taiwan than on the mainland, and is used as a secondary electronic input method for Taiwanese Mandarin, as well as in dictionaries and other non-official documents.
Representations
System
Representation (click value to copy)
Nº
12709
UTF-8
E3 86 A5
UTF-16
31 A5
UTF-32
00 00 31 A5
URL-Quoted
%E3%86%A5
HTML hex reference
ㆥ
Wrong windows-1252 Mojibake
ㆥ
Encoding: GB18030 (hex bytes)
81 39 B4 39
RFC 5137
\u'31A5'
Bash and Zsh inside echo -e
\u31A5
C and C++
\u31A5
C#
\u31A5
CSS
\0031A5
Excel
=UNICHAR(12709)
Go
\u31A5
JavaScript
\u31A5
Modern JavaScript since ES6
\u{31a5}
JSON
\u31A5
Java
\u31A5
Lua
\u{31A5}
Matlab
char(12709)
Perl
"\x{31A5}"
PHP
\u{31a5}
PostgreSQL
U&'\31A5'
PowerShell
`u{31A5}
Python
\u31A5
Ruby
\u{31a5}
Rust
\u{31a5}
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