The CJK Compatibility Ideographs block spans U+F900–U+FAFF, 512 codepoints in Plane 0 (Basic Multilingual Plane). 472 are assigned in Unicode 16.0; the other 40 are reserved for future characters.
All of its characters belong to the Han script.
By general category: 472 other letters (Lo).
The first 302 arrived in Unicode 1.1 (1993); later additions came in 3.2 (59), 4.1 (106), 5.2 (3), 6.1 (2).
460 characters here are precomposed and have canonical decompositions, so NFD splits them into a base letter plus combining marks. See normalization.
472 characters are East Asian Wide or Fullwidth and take two columns in terminals.