This character is a Other Letter and is mainly used in the Katakana 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. This katakana joins with other adjacent katakana to form a word. U+30A8 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:
In Japanese writing, the kana え (hiragana) and エ (katakana) (romanised e) occupy the fourth place, between う and お, in the modern Gojūon (五十音) system of collating kana. In the Iroha, they occupy the 34th, between こ and て. In the table at right (ordered by columns, from right to left), え lies in the first column (あ行, "column A") and the fourth row (え段, "row E"). Both represent [e].
Representations
System
Representation (click value to copy)
Nº
12456
UTF-8
E3 82 A8
UTF-16
30 A8
UTF-32
00 00 30 A8
URL-Quoted
%E3%82%A8
HTML hex reference
エ
Wrong windows-1252 Mojibake
エ
Encoding: BIG5 (hex bytes)
C7 40
Encoding: BIG5HKSCS (hex bytes)
C7 A4
Encoding: CP932 (hex bytes)
83 47
Encoding: CP949 (hex bytes)
AB A8
Encoding: CP950 (hex bytes)
C7 40
Encoding: EUC_JP (hex bytes)
A5 A8
Encoding: EUC_JIS_2004 (hex bytes)
A5 A8
Encoding: EUC_JISX0213 (hex bytes)
A5 A8
Encoding: EUC_KR (hex bytes)
AB A8
Encoding: GB2312 (hex bytes)
A5 A8
Encoding: GBK (hex bytes)
A5 A8
Encoding: GB18030 (hex bytes)
A5 A8
Encoding: HZ (hex bytes)
7E 7B 25 28 7E 7D
Encoding: ISO2022_JP (hex bytes)
1B 24 42 25 28 1B 28 42
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 42 25 28 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 42 25 28 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 42 25 28 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 42 25 28 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 42 25 28 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 2B 28 0F
Encoding: JOHAB (hex bytes)
DE 38
Encoding: SHIFT_JIS (hex bytes)
83 47
Encoding: SHIFT_JIS_2004 (hex bytes)
83 47
Encoding: SHIFT_JISX0213 (hex bytes)
83 47
Adobe Glyph List
ekatakana
digraph
E6
RFC 5137
\u'30A8'
Bash and Zsh inside echo -e
\u30A8
C and C++
\u30A8
C#
\u30A8
CSS
\0030A8
Excel
=UNICHAR(12456)
Go
\u30A8
JavaScript
\u30A8
Modern JavaScript since ES6
\u{30a8}
JSON
\u30A8
Java
\u30A8
Lua
\u{30A8}
Matlab
char(12456)
Perl
"\x{30A8}"
PHP
\u{30a8}
PostgreSQL
U&'\30A8'
PowerShell
`u{30A8}
Python
\u30A8
Ruby
\u{30a8}
Rust
\u{30a8}
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