You can enter or format type as superscript or subscript characters. Superscript characters are reduced in size and shifted above the type baseline; subscript characters are reduced in size and shifted below the type baseline. If the font does not include superscript or subscript characters, Photoshop generates faux superscript or subscript characters.
To specify superscript or subscript characters:
Select the type you want to specify.
Do one of the following:
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.