This code point first appeared in version 1.1 of the Unicode® Standard and belongs to the "Arabic Presentation Forms-B" block which goes from 0xFE70 to 0xFEFF.
You can safely add this character in your html code with the entity: 
It is sometimes abbreviated as BOM or ZWNBSP.
Alternatively, it can also be called BYTE ORDER MARK.
You can use the u+FEFF copy pc button below.
Easy u+FEFF copy paste:
Unicode meta-data
The following table show specific meta-data that is known about this character.The u+FEFF name is zero width no-break space emoji.
| field | value |
|---|---|
| Codepoint (hex) | FEFF, uFEFF |
| Character age | Unicode 1.1 |
| Legacy name (Unicode 1.0) | BYTE ORDER MARK |
| Official name (Unicode 15.0) | ZERO WIDTH NO-BREAK SPACE |
| resolved name | zero width no-break space |
| block | Arabic Presentation Forms-B (Arabic_PF_B) |
| common typos | u+EFFF, u+FFEF |
There are alternative spelling that can be found in the wild for the unicode character FEFF like u FEFF, (u+FEFF) or u +FEFF. You can also find u-FEFF, u*FEFF, un+FEFF, uFEFF, u=FEFF or c+FEFF. You can also spell it with u FEFF unicode, u plus FEFF, uncode FEFF or unicode + FEFF.
Its bidirectional class is "BN":Boundary Neutral (Default ignorables, non-characters, and control characters, other than those explicitly given other types.)
Glyphs and symbols in your browser
The following unicode chart presents different versions of the glyph corresponding to the unicode characters u+FEFF 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-B 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 +uFEFF allows you to see the value of the character in different encodings
| encoding | hexadecimal | decimal | binary |
|---|---|---|---|
| UTF-8 | EF BB BF | 15711167 | 11101111 10111011 10111111 |
| UCS2 | FF FE | 65534 | 11111111 11111110 |
| UTF-16LE | FF FE | 65534 | 11111111 11111110 |
| UTF-16BE | FE FF | 65279 | 11111110 11111111 |
| UTF7 | 2B 2F 76 38 2D | 185479870509 | 00101011 00101111 01110110 00111000 00101101 |
| UTF7-IMAP | 26 2C 76 38 2D | 163954702381 | 00100110 00101100 01110110 00111000 00101101 |