This character is a Other Letter and is mainly used in the Hiragana 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+304A offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
In Japanese writing, the kana お (hiragana) and オ (katakana) occupy the fifth place, between え and か, in the modern Gojūon (五十音) system of collating kana. In the Iroha, they occupy the 27th, between の and く. In the table at right (ordered by columns, from right to left), お lies in the first column (あ行, "column A") and the fifth row (お段, "row O"). Both represent [o].
Representations
System
Representation (click value to copy)
Nº
12362
UTF-8
E3 81 8A
UTF-16
30 4A
UTF-32
00 00 30 4A
URL-Quoted
%E3%81%8A
HTML hex reference
お
Wrong windows-1252 Mojibake
ãŠ
Encoding: BIG5 (hex bytes)
C6 AE
Encoding: BIG5HKSCS (hex bytes)
C6 F0
Encoding: CP932 (hex bytes)
82 A8
Encoding: CP949 (hex bytes)
AA AA
Encoding: CP950 (hex bytes)
C6 AE
Encoding: EUC_JP (hex bytes)
A4 AA
Encoding: EUC_JIS_2004 (hex bytes)
A4 AA
Encoding: EUC_JISX0213 (hex bytes)
A4 AA
Encoding: EUC_KR (hex bytes)
AA AA
Encoding: GB2312 (hex bytes)
A4 AA
Encoding: GBK (hex bytes)
A4 AA
Encoding: GB18030 (hex bytes)
A4 AA
Encoding: HZ (hex bytes)
7E 7B 24 2A 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 24 2A 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 24 2A 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 24 2A 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 24 2A 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 24 2A 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 24 2A 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2A 2A 0F
Encoding: JOHAB (hex bytes)
DD AA
Encoding: SHIFT_JIS (hex bytes)
82 A8
Encoding: SHIFT_JIS_2004 (hex bytes)
82 A8
Encoding: SHIFT_JISX0213 (hex bytes)
82 A8
Adobe Glyph List
ohiragana
digraph
o5
RFC 5137
\u'304A'
Bash and Zsh inside echo -e
\u304A
C and C++
\u304A
C#
\u304A
CSS
\00304A
Excel
=UNICHAR(12362)
Go
\u304A
JavaScript
\u304A
Modern JavaScript since ES6
\u{304a}
JSON
\u304A
Java
\u304A
Lua
\u{304A}
Matlab
char(12362)
Perl
"\x{304A}"
PHP
\u{304a}
PostgreSQL
U&'\304A'
PowerShell
`u{304A}
Python
\u304A
Ruby
\u{304a}
Rust
\u{304a}
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