Superior letter

In modern usage, with word processors and text entry interfaces, superscript and superior letters are produced in the same way and look identical.

Other abbreviations containing superior letters are mdise for marchandise ('merchandise'), échce for échéance ('due date'), and Mo for métro ('subway').

Superior letters are used to shorten various words[5] in order to save space: f.o (folio 'page'); titles: D.a (doña 'Lady, Ms.'); personal compound given names: M.a Cristina (María Cristina) and regular administrative expressions: imp.to (impuesto 'tax').

These abbreviations sometimes employed superior letters; for example, Alexr for Alexander, Nics for Nicholas.

[7] Most typewriters for Spanish and other Romance languages had keys that could enter o and a directly, as a shorthand intended to be used primarily with ordinal numbers, such as 1.o for first.

Apart from Microsoft’s Calibri or Cambria, in most of the commonly available computer fonts today, ordinal indicators are not underlined.

In Unicode, it is assigned to character U+2116 NUMERO SIGN (№) within the Letterlike Symbols block.

Other superscript letters are used as an alternative way to represent double articulated consonants, for example [tˢ] for [t͡s].