This character is a Other Letter and is mainly used in the Hangul script. The character is also known as E.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+1166 forms a Korean syllable block with similar characters, which prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
ㅔ(e, IPA:[e]) is one of the Korean hangul.
Representations
System
Representation (click value to copy)
Nº
4454
UTF-8
E1 85 A6
UTF-16
11 66
UTF-32
00 00 11 66
URL-Quoted
%E1%85%A6
HTML hex reference
ᅦ
Wrong windows-1252 Mojibake
á…¦
alias
E
Encoding: GB18030 (hex bytes)
81 33 A7 38
RFC 5137
\u'1166'
Bash and Zsh inside echo -e
\u1166
C and C++
\u1166
C#
\u1166
CSS
\001166
Excel
=UNICHAR(4454)
Go
\u1166
JavaScript
\u1166
Modern JavaScript since ES6
\u{1166}
JSON
\u1166
Java
\u1166
Lua
\u{1166}
Matlab
char(4454)
Perl
"\x{1166}"
PHP
\u{1166}
PostgreSQL
U&'\1166'
PowerShell
`u{1166}
Python
\u1166
Ruby
\u{1166}
Rust
\u{1166}
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