Superscript
/ˈsuːpərskrɪpt/
Definition 1 of 2
Pro Tip 1/3Math & Science
Superscript is especially common in scientific formulas and mathematical expressions. E=mc^2, where '2' is in superscript.
Pro Tip 2/3Not For Emphasis
Superscript isn't used for emphasizing text; that's what bold or italics are for. 
Do not write 'very' as 'very', use bold or italics instead.
Pro Tip 3/3Ordinals In Text
Use superscript for ordinal indicators in dates and numbers in non-technical writing. She was born on January 1^st^ and he on the 2^nd^.