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+305B offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
せ, in hiragana, or セ in katakana, is one of the Japanese kana, each of which represents one mora. Both represent the sound [se], and when written with dakuten represent the sound [ze]. In the Ainu language, the katakana セ is sometimes written with a handakuten (which can be entered into a computer as either one character (セ゚) or two combined ones (セ゜) to represent the [t͡se] sound, and is interchangeable with ツェ (tse).
Representations
System
Representation (click value to copy)
Nº
12379
UTF-8
E3 81 9B
UTF-16
30 5B
UTF-32
00 00 30 5B
URL-Quoted
%E3%81%9B
HTML hex reference
せ
Wrong windows-1252 Mojibake
ã›
Encoding: BIG5 (hex bytes)
C6 BF
Encoding: BIG5HKSCS (hex bytes)
C7 42
Encoding: CP932 (hex bytes)
82 B9
Encoding: CP949 (hex bytes)
AA BB
Encoding: CP950 (hex bytes)
C6 BF
Encoding: EUC_JP (hex bytes)
A4 BB
Encoding: EUC_JIS_2004 (hex bytes)
A4 BB
Encoding: EUC_JISX0213 (hex bytes)
A4 BB
Encoding: EUC_KR (hex bytes)
AA BB
Encoding: GB2312 (hex bytes)
A4 BB
Encoding: GBK (hex bytes)
A4 BB
Encoding: GB18030 (hex bytes)
A4 BB
Encoding: HZ (hex bytes)
7E 7B 24 3B 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 24 3B 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 24 3B 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 24 3B 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 24 3B 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 24 3B 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 24 3B 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2A 3B 0F
Encoding: JOHAB (hex bytes)
DD BB
Encoding: SHIFT_JIS (hex bytes)
82 B9
Encoding: SHIFT_JIS_2004 (hex bytes)
82 B9
Encoding: SHIFT_JISX0213 (hex bytes)
82 B9
Adobe Glyph List
sehiragana
digraph
se
RFC 5137
\u'305B'
Bash and Zsh inside echo -e
\u305B
C and C++
\u305B
C#
\u305B
CSS
\00305B
Excel
=UNICHAR(12379)
Go
\u305B
JavaScript
\u305B
Modern JavaScript since ES6
\u{305b}
JSON
\u305B
Java
\u305B
Lua
\u{305B}
Matlab
char(12379)
Perl
"\x{305B}"
PHP
\u{305b}
PostgreSQL
U&'\305B'
PowerShell
`u{305B}
Python
\u305B
Ruby
\u{305b}
Rust
\u{305b}
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