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. The word that U+01DD forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 6 other glyphs.
The Wikipedia has the following information about this codepoint:
Ǝ ǝ (turned E or reversed E) is an additional letter of the Latin alphabet used in African languages using the Pan-Nigerian alphabet. The minuscule is based on a rotated e and the capital form majuscule Ǝ, based on a reversed (mirrored) majuscule E.
It is not to be confused with U+2203∃THERE EXISTS, the existential quantifier used in logic, or with U+0259əLATIN SMALL LETTER SCHWA (uppercase Ə), which is used as a phonetic symbol and as a letter in Latin-based orthographies, such as Azerbaijani and the General Alphabet of Cameroon Languages.
In MacOS with the U.S. Extended keyboard, the letters Ǝ ǝ are made with ⌥ Opt+⇧ Shift+: followed by E e respectively.
The letter has been used by American rapper Eminem in order to stylize his stage name.
Representations
System
Representation (click value to copy)
Nº
477
UTF-8
C7 9D
UTF-16
01 DD
UTF-32
00 00 01 DD
URL-Quoted
%C7%9D
HTML hex reference
ǝ
Wrong windows-1252 Mojibake
Ç
Encoding: GB18030 (hex bytes)
81 30 A0 33
AGL: Latin-5
uni01DD
Adobe Glyph List
eturned
RFC 5137
\u'01DD'
Bash and Zsh inside echo -e
\u01DD
C and C++
\u01DD
C#
\u01DD
CSS
\0001DD
Excel
=UNICHAR(477)
Go
\u01DD
JavaScript
\u01DD
Modern JavaScript since ES6
\u{1dd}
JSON
\u01DD
Java
\u01DD
Lua
\u{1DD}
Matlab
char(477)
Perl
"\x{1DD}"
PHP
\u{1dd}
PostgreSQL
U&'\01DD'
PowerShell
`u{1DD}
Python
\u01DD
Ruby
\u{1dd}
Rust
\u{1dd}
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