The Arabic Presentation Forms-B block spans U+FE70–U+FEFF, 144 codepoints in Plane 0 (Basic Multilingual Plane). 141 are assigned in Unicode 16.0; the other 3 are reserved for future characters.
By script: Arabic (140), Common (1).
By general category: 140 other letters (Lo), 1 format characters (Cf).
The first 140 arrived in Unicode 1.1 (1993); later additions came in 3.2 (1).
139 characters here have compatibility decompositions: they are formatting variants of other characters and are replaced by them under NFKC and NFKD. See normalization.
Most letters here are written right to left. See bidirectional text.