The Ordinal indicator reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Ordinal indicator

The symbols º and ª are ordinal indicators, used to denote ordinal numbers in some languages.

The equivalent of the adjective "12^th" in the Spanish and Portuguese languages is "12º" when the noun being modified is of masculine grammatical gender. The corresponding symbol is used in "12ª" when the noun is feminine. º and ª also appear in the abbreviations for "Numero" and "Numera", which are the translations of the English word "Number". For example, instead of "No. 12 Privet Drive", one would write "Nº 12 Privet Drive".

Note: The degree symbol ° is different from both º and ª, although its appearance is almost identical in some fonts.

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