The Optical Character Recognition block spans U+2440–U+245F, 32 codepoints in Plane 0 (Basic Multilingual Plane). 11 are assigned in Unicode 16.0; the other 21 are reserved for future characters.
All of its characters have the script value Common: they are shared across writing systems rather than tied to one.
By general category: 11 other symbols (So).
The first 11 arrived in Unicode 1.1 (1993).