This character is a Other Letter and is mainly used in the Hangul script.
The glyph is a compatibility version of the glyph Hangul Jungseong O. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+3157 offers a line break opportunity at its position, except in some numeric contexts. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
ㅗ (o) is one of the Korean hangul.
Representations
System
Representation (click value to copy)
Nº
12631
UTF-8
E3 85 97
UTF-16
31 57
UTF-32
00 00 31 57
URL-Quoted
%E3%85%97
HTML hex reference
ㅗ
Wrong windows-1252 Mojibake
ã…—
Encoding: CP949 (hex bytes)
A4 C7
Encoding: EUC_KR (hex bytes)
A4 C7
Encoding: GB18030 (hex bytes)
81 39 AD 31
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 28 43 24 47 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 24 47 0F
Encoding: JOHAB (hex bytes)
85 A1
Adobe Glyph List
okorean
RFC 5137
\u'3157'
Bash and Zsh inside echo -e
\u3157
C and C++
\u3157
C#
\u3157
CSS
\003157
Excel
=UNICHAR(12631)
Go
\u3157
JavaScript
\u3157
Modern JavaScript since ES6
\u{3157}
JSON
\u3157
Java
\u3157
Lua
\u{3157}
Matlab
char(12631)
Perl
"\x{3157}"
PHP
\u{3157}
PostgreSQL
U&'\3157'
PowerShell
`u{3157}
Python
\u3157
Ruby
\u{3157}
Rust
\u{3157}
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