Block from U+2070 to U+209F. This block was introduced in Unicode version 1.1 (1993). It contains 42 codepoints.
The Wikipedia provides the following information on block Superscripts and Subscripts:
Superscripts and Subscripts is a Unicode block containing superscript and subscript numerals, mathematical operators, and letters used in mathematics and phonetics. Other superscript letters can be found in the Spacing Modifier Letters, Phonetic Extensions and Phonetic Extensions Supplement blocks, while the superscript 1, 2, and 3, inherited from ISO 8859-1, were included in the Latin-1 Supplement block.