Unicode Characters: Specials
DecimalCharHexRemarkUnicodeGroup •marks start of annotated textU+FFF9_last updated 11 Jul 2019•marks start of annotating character(s)U+FFFA_last updated 11 Jul 2019•marks end of annotation blockU+FFFB_last updated 11 Jul 2019•used as placeholder in text for an otherwise unspecified objectU+FFFC_last updated 11 Jul 2019���•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 signU+FFFD_last updated 11 Jul 2019•may be used to detect byte order by contrast with FEFF ⬚→FEFF ⬚ zero width no-break spaceU+FFFE_last updated 11 Jul 2019 U+FFFF_last updated 11 Jul 2019
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