This character is a Other Letter and is mainly used in the Katakana script. The character is also known as SMALL TSU.
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. This katakana joins with other adjacent katakana to form a word. U+30C3 prohibits line breaks before its position. There are some exceptions, though.
The Wikipedia has the following information about this codepoint:
The sokuon (促音) is a Japanese symbol in the form of a small hiragana or katakana tsu, as well as the various consonants represented by it. In less formal language, it is called chiisai tsu (小さいつ) or chiisana tsu (小さなつ), meaning "small tsu". It serves multiple purposes in Japanese writing.
Representations
System
Representation (click value to copy)
Nº
12483
UTF-8
E3 83 83
UTF-16
30 C3
UTF-32
00 00 30 C3
URL-Quoted
%E3%83%83
HTML hex reference
ッ
Wrong windows-1252 Mojibake
ッ
alias
SMALL TSU
Encoding: BIG5 (hex bytes)
C7 5B
Encoding: BIG5HKSCS (hex bytes)
C7 BF
Encoding: CP932 (hex bytes)
83 62
Encoding: CP949 (hex bytes)
AB C3
Encoding: CP950 (hex bytes)
C7 5B
Encoding: EUC_JP (hex bytes)
A5 C3
Encoding: EUC_JIS_2004 (hex bytes)
A5 C3
Encoding: EUC_JISX0213 (hex bytes)
A5 C3
Encoding: EUC_KR (hex bytes)
AB C3
Encoding: GB2312 (hex bytes)
A5 C3
Encoding: GBK (hex bytes)
A5 C3
Encoding: GB18030 (hex bytes)
A5 C3
Encoding: HZ (hex bytes)
7E 7B 25 43 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 25 43 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 25 43 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 25 43 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 25 43 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 25 43 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 25 43 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2B 43 0F
Encoding: JOHAB (hex bytes)
DE 53
Encoding: SHIFT_JIS (hex bytes)
83 62
Encoding: SHIFT_JIS_2004 (hex bytes)
83 62
Encoding: SHIFT_JISX0213 (hex bytes)
83 62
Adobe Glyph List
tusmallkatakana
digraph
TU
RFC 5137
\u'30C3'
Bash and Zsh inside echo -e
\u30C3
C and C++
\u30C3
C#
\u30C3
CSS
\0030C3
Excel
=UNICHAR(12483)
Go
\u30C3
JavaScript
\u30C3
Modern JavaScript since ES6
\u{30c3}
JSON
\u30C3
Java
\u30C3
Lua
\u{30C3}
Matlab
char(12483)
Perl
"\x{30C3}"
PHP
\u{30c3}
PostgreSQL
U&'\30C3'
PowerShell
`u{30C3}
Python
\u30C3
Ruby
\u{30c3}
Rust
\u{30c3}
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