Specials (Unicode block)
Specials is a short Unicode block of characters allocated at the very end of the Basic Multilingual Plane, at U+FFF0–FFFF, containing these code points: 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, unrecognised, or unrepresentable character U+FFFE <noncharacter-FFFE> not a character.