Block: Specials

Range U+FFF0 - U+FFFF
Official Chart http://www.unicode.org/charts/PDF/UFFF0.pdf
Wikipedia Specials is a short Unicode block allocated at the very end of the Basic Multilingual Plane, at U+FFF0U+FFFF. Of these 16 code points, five are assigned as of Unicode 12.0:

U+FFF9 INTERLINEAR ANNOTATION ANCHOR, marks start of annotated text
U+FFFA INTERLINEAR ANNOTATION SEPARATOR, marks start of annotating character(s)
U+FFFB INTERLINEAR ANNOTATION TERMINATOR, marks end of annotation block
U+FFFC  OBJECT REPLACEMENT CHARACTER, placeholder in the text for another unspecified object, for example in a compound document.
U+FFFD � REPLACEMENT CHARACTER used to replace an unknown, unrecognized or unrepresentable character
U+FFFE U+FFFE> not a character.
U+FFFF U+FFFF> not a character.FFFE and FFFF are not unassigned in the usual sense, but guaranteed not to be a Unicode character at all.
https://en.wikipedia.org/wiki/Specials_(Unicode_block)
Characters
￿