Interlinear annotation |
FFF9 | | Interlinear Annotation Anchor |
| | • | marks start of annotated text |
FFFA | | Interlinear Annotation Separator |
| | • | marks start of annotating character(s) |
FFFB | | Interlinear Annotation Terminator |
| | • | marks end of annotation block |
Replacement characters |
FFFC |  | Object Replacement Character |
| | • | used as placeholder in text for an otherwise unspecified object |
FFFD | � | Replacement Character |
| | • | used to replace an incoming character whose value is unknown or unrepresentable in Unicode |
| | • | compare the use of 001A ␚ as a control character to indicate the substitute function |
| | → | 2BD1 ⯑ uncertainty sign |
| | → | 1FBC4 🯄 negative squared question mark |
Noncharacters |
FFFE | █ | <Not A Character> |
| | • | may be used to detect byte order by contrast with FEFF ⬚ |
| | → | FEFF ⬚ zero width no-break space |
FFFF | █ | <Not A Character> |