Is 0xFFFF a valid Unicode character? [duplicate]

Answer 1

Go to the Unicode web site unicode.org/charts and enter FFFF in the box. It will give you a PDF to download (UFFF0.pdf for this character code; different files for different codes).

You'll find that U+FFFF is not a valid Unicode character:

FFFF <not a character>

• The value FFFF is guaranteed not to be a Unicode character at all

Answer 2

As stated in this great answer it is not, it is a reserved non character.