They can be used to guess a text's encoding scheme, since any text containing these is by definition not a correctly encoded Unicode text. U+FFFD � REPLACEMENT CHARACTER used to replace an unknown, unrecognized, or unrepresentable characterįFFE and FFFF are not unassigned in the usual sense, but guaranteed not to be Unicode characters at all.U+FFFC  OBJECT REPLACEMENT CHARACTER, placeholder in the text for another unspecified object, for example in a compound document. U+FFFB INTERLINEAR ANNOTATION TERMINATOR, marks end of annotation block.U+FFFA INTERLINEAR ANNOTATION SEPARATOR, marks start of annotating character(s).U+FFF9 INTERLINEAR ANNOTATION ANCHOR, marks start of annotated text.Of these 16 code points, five have been assigned since Unicode 3.0: Specials is a short Unicode block allocated at the very end of the Basic Multilingual Plane, at U+FFF0–FFFF.
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