There are several use cases for superscript in various languages:

• Breton
  • 1^añ in 1añ Genver Q2150
  • I^añ in Lucius Iañ Q132793
• Francoprovençal
  • I^ér in Bartelomél Iér de Constantinople Q44501
• French:
  • 1^er in 1er arrondissement de Paris Q161741
  • I^er in Ier millénaire Q25868
• Occitan
  • I^èr in Rogièr Ièr de Fois Q1394056
• Spanish:
  • n.^os in Conciertos para piano n.os 1-4 (Mozart) Q162904
  • 3.^er in 3.er Regimiento de Infantería de Marina (Estados Unidos) Q4636844

@Oliv0 and @Bugreporter: ᵃᵇᶜᵈᵉᶠᵍʰⁱʲᵏˡᵐⁿᵒᵖʳˢᵗᵘᵛʷˣʸᶻ are not meant to be used as typographic superscripts. They are meant for very specific phonetics uses as they are modifier letters.