Superscript and subscript text (also called superior and inferior text) is reduced‑size text that is raised or lowered in relation to a font’s baseline. If the font does not include superscript or subscript characters, Photoshop generates faux superscript or subscript characters.
Click the Superscript button or
the Subscript button
in
the Character palette.
Choose Superscript or Subscript from the Character palette menu. A check mark indicates that the option is selected.