The Block Elements block spans U+2580–U+259F, 32 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: 32 other symbols (So).
The first 22 arrived in Unicode 1.1 (1993); later additions came in 3.2 (10).