U+FDED is not a valid Unicode code point / character.
It belongs to the "Arabic Presentation Forms-A" block which goes from 0xFB50 to 0xFDFF but is not defined in the Unicode 15.0 database of code points.
This code point first appeared in version of the Unicode® Standard and belongs to the "Arabic Presentation Forms-A" block which goes from 0xFB50 to 0xFDFF.
You can safely add this character in your html code with the entity: 
You can use the u+FDED copy pc button below.
Easy u+FDED copy paste:
Unicode meta-data
The following table show specific meta-data that is known about this character.
| field | value |
|---|---|
| Codepoint (hex) | FDED, uFDED |
| Legacy name (Unicode 1.0) | - |
| Official name (Unicode 15.0) | - |
| resolved name | |
| block | Arabic Presentation Forms-A (Arabic_PF_A) |
| common typos | u+DFED, u+EFDD |
There are alternative spelling that can be found in the wild for the unicode character FDED like u FDED, (u+FDED) or u +FDED. You can also find u-FDED, u*FDED, un+FDED, uFDED, u=FDED or c+FDED. You can also spell it with u FDED unicode, u plus FDED, uncode FDED or unicode + FDED.
Glyphs and symbols in your browser
The following unicode chart presents different versions of the glyph corresponding to the unicode characters u+FDED that are available on your computer.
In order to type this character easily, you may want to download and install a unicode Arabic Presentation Forms-A keyboard.
A sample of fonts are used below to display whether the character has a glyph in this font or not.
Encodings (Unicode characters converter)
The following character table converter for +uFDED allows you to see the value of the character in different encodings
| encoding | hexadecimal | decimal | binary |
|---|---|---|---|
| UTF-8 | EF B7 AD | 15710125 | 11101111 10110111 10101101 |
| UCS2 | ED FD | 60925 | 11101101 11111101 |
| UTF-16LE | ED FD | 60925 | 11101101 11111101 |
| UTF-16BE | FD ED | 65005 | 11111101 11101101 |
| UTF7 | 2B 2F 65 30 2D | 185478754349 | 00101011 00101111 01100101 00110000 00101101 |
| UTF7-IMAP | 26 2C 65 30 2D | 163953586221 | 00100110 00101100 01100101 00110000 00101101 |