The Kanbun block spans U+3190–U+319F, 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: 12 other symbols (So), 4 other numbers (No).
The first 16 arrived in Unicode 1.1 (1993).
14 characters here have compatibility decompositions: they are formatting variants of other characters and are replaced by them under NFKC and NFKD. See normalization.
16 characters are East Asian Wide or Fullwidth and take two columns in terminals.