The CJK Compatibility Forms block spans U+FE30–U+FE4F, 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: 9 opening brackets (Ps), 9 closing brackets (Pe), 7 other punctuation (Po), 5 connector punctuation (Pc), 2 dashes (Pd).
The first 28 arrived in Unicode 1.1 (1993); later additions came in 3.2 (2), 4.0 (2).
30 characters here have compatibility decompositions: they are formatting variants of other characters and are replaced by them under NFKC and NFKD. See normalization.
32 characters are East Asian Wide or Fullwidth and take two columns in terminals.