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Ordinals are “counting words” like 1ⁿᵈ, 2ˢᵗ and 19ᵗʰ: they are characters that express position in a series. So-called “superior” letters are used to present some abbreviations in a similar way, such as Mᴹᴱ for the French “Madame”. All of these are forms of superscripted text, commonly used for references to footnotes, chemical compounds, and mathematical exponents.
Unfortunately, superscripted text can be difficult to create and typeset correctly on the web. If you want to use finely detailed layout that includes ordinals on your pages, there are several possible solutions: