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- 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 <noncharacter-FFFE> not a character.
- U+FFFF <noncharacter-FFFF> not a character.
(16 code points)
|Assigned||5 code points|
|Unused||9 reserved code points |
|Unicode version history|
|1.0.0 (1991)||1 (+1)|
|2.1 (1998)||2 (+1)|
|3.0 (1999)||5 (+3)|
FFFE and FFFF are not unassigned in the usual sense, but guaranteed not to be Unicode characters at all. 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. Unicode's U+FEFF BYTE ORDER MARK character can be inserted at the beginning of a Unicode text to signal its endianness: a program reading such a text and encountering 0xFFFE would then know that it should switch the byte order for all the following characters.