U+FDD7 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+FDD7 copy pc button below.
Easy u+FDD7 copy paste:
Unicode meta-data
The following table show specific meta-data that is known about this character.
| field | value |
|---|---|
| Codepoint (hex) | FDD7, uFDD7 |
| Legacy name (Unicode 1.0) | - |
| Official name (Unicode 15.0) | - |
| resolved name | |
| block | Arabic Presentation Forms-A (Arabic_PF_A) |
| common typos | u+DFD7, u+DFD7 |
There are alternative spelling that can be found in the wild for the unicode character FDD7 like u FDD7, (u+FDD7) or u +FDD7. You can also find u-FDD7, u*FDD7, un+FDD7, uFDD7, u=FDD7 or c+FDD7. You can also spell it with u FDD7 unicode, u plus FDD7, uncode FDD7 or unicode + FDD7.
Glyphs and symbols in your browser
The following unicode chart presents different versions of the glyph corresponding to the unicode characters u+FDD7 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 +uFDD7 allows you to see the value of the character in different encodings
| encoding | hexadecimal | decimal | binary |
|---|---|---|---|
| UTF-8 | EF B7 97 | 15710103 | 11101111 10110111 10010111 |
| UCS2 | D7 FD | 55293 | 11010111 11111101 |
| UTF-16LE | D7 FD | 55293 | 11010111 11111101 |
| UTF-16BE | FD D7 | 64983 | 11111101 11010111 |
| UTF7 | 2B 2F 64 63 2D | 185478701869 | 00101011 00101111 01100100 01100011 00101101 |
| UTF7-IMAP | 26 2C 64 63 2D | 163953533741 | 00100110 00101100 01100100 01100011 00101101 |