This is how in brings better typography:
Ordinals (ordn) set the letters following a number superscripted, to denote that number is an ordinal one (represent position in a sequential order), like 1st or 2nd.
Fonts that have this feature includes Source Sans Pro and Lato. Try them with text like “1st 2nd 3rd”, “1o 1a” and “Nº No”.