Ordinal indicator

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In written languages, an ordinal indicator is a sign adjacent to a numeral denoting that it is an ordinal number, rather than a cardinal number. The exact sign used varies in different languages:

English: The suffixes -st (e.g., 21st), -nd or -d (e.g., 22nd), -rd or -d (e.g., 23rd), and -th (e.g., 24th) are used. Formerly, these indicators were superscripts (2^nd, 34^th) but by the late 20th century, formatting them on the line was favoured. The superscript style has, since the 1990s, been revived somewhat as some word processors format ordinal indicators as superscripts automatically. This automatic formatting has become notorious as part of Ra^thergate.
French: The suffixes ^-er (e.g., 1^er — premier), ^-re (e.g., 1^re — première), and ^-e (e.g., 2^e — deuxième). These indicators use superscript formatting whenever it is available.
Dutch: Unlike other Germanic languages, Dutch is similar to English in this respect: the French layout with ^-e used to be popular, but the recent spelling changes now prescribe the suffix -e. Optionally -ste and -de may be used.
Danish, Finnish, German, Hungarian, Icelandic, Slovenian, Serbian: A period or full stop is written after the numeral. The same usage, apparently borrowed from German, is now a standard in Polish, where it replaced the superscript of the last phoneme (following complex declension and gender patterns, e.g., 1-szy, 7-ma, 24-te, 100-ny; use of such contractions is considered an error).
Italian, Portuguese, and Spanish: The suffixes ^-o and ^-a are appended to the numeral depending on whether the number's grammatical gender is masculine or feminine respectively. As with French, these signs are preferably superscripted, but in contrast, they are often underlined as well. Some character sets, including Unicode, provide characters specifically for use as ordinal indicators in these languages: º and ª. The masculine ordinal indicator U+00BA (º) is often confused with the degree sign U+00B0 (°), which looks very similar in many fonts. The degree sign is a uniform circle and is never underlined, while the letter o may be oval or elliptical and have a varying stroke width. The letter o may be also underlined.; In Spanish primer (an adjective form of primero) is not abbreviated as 1º but as 1^er. Spanish also uses the indicators in some abbreviations (Vº Bº, visto bueno, "Approved"; Mª, María, a Spanish name frequently used in compounds like José Mª).