The Supplemental Arrows-A block spans U+27F0–U+27FF, 16 codepoints in Plane 0 (Basic Multilingual Plane). Every one of them is assigned in Unicode 16.0.
All of its characters have the script value Common: they are shared across writing systems rather than tied to one.
By general category: 16 math symbols (Sm).
The first 16 arrived in Unicode 3.2 (2002).