The Syriac Supplement block spans U+0860–U+086F, 16 codepoints in Plane 0 (Basic Multilingual Plane). 11 are assigned in Unicode 16.0; the other 5 are reserved for future characters.
All of its characters belong to the Syriac script.
By general category: 11 other letters (Lo).
The first 11 arrived in Unicode 10.0 (2017).
Most letters here are written right to left. See bidirectional text.