The Superscripts and Subscripts block spans U+2070–U+209F, 48 codepoints in Plane 0 (Basic Multilingual Plane). 42 are assigned in Unicode 16.0; the other 6 are reserved for future characters.
By script: Common (27), Latin (15).
By general category: 17 other numbers (No), 15 modifier letters (Lm), 6 math symbols (Sm), 2 opening brackets (Ps), 2 closing brackets (Pe).
The first 28 arrived in Unicode 1.1 (1993); later additions came in 3.2 (1), 4.1 (5), 6.0 (8).
42 characters here have compatibility decompositions: they are formatting variants of other characters and are replaced by them under NFKC and NFKD. See normalization.