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In written languages, an ordinal indicator is a character, or group of characters, following a numeral denoting that it is an ordinal number, rather than a cardinal number. Historically these letters were "elevated terminals", that is to say the last few letters of the full word denoting the ordinal form of the number displayed as a superscript .
Ordinal indicators are sometimes written as superscripts (1 st, 2 nd, 3 rd, 4 th, rather than 1st, 2nd, 3rd, 4th), although many English-language style guides recommend against this use. [4] Romance languages use a similar convention, such as 1 er or 2 e in French, or 4ª and 4º in Galician and Italian, or 4.ª and 4.º in Portuguese and Spanish.
Feminine ordinal indicator: Masculine ordinal indicator, Degree sign (many) Fleuron: Dinkus, Dingbat Floral heart: Dingbat, Dinkus, Hedera, Index: Fleuron. Full stop: Interpunct, Period: Decimal separator: ♀ ♂ ⚥ Gender symbol: LGBT symbols ` Grave (symbol) Quotation mark#Typewriters and early computers ̀: Grave (diacrictic) Acute ...
Ordinal indicator – Character(s) following an ordinal number (used when writing ordinal numbers, such as a super-script) Ordinal number – Generalization of "n-th" to infinite cases (the related, but more formal and abstract, usage in mathematics) Ordinal data, in statistics; Ordinal date – Date written as number of days since first day of ...
The change also makes the superscript letters useful for ordinal indicators, more closely matching the ª and º characters. However, it makes them incorrect for normal superscript and subscript, and so chemical and algebraic formulas are better rendered by using markup.
The abbreviations nro. and núm. are also acceptable. The numero sign, either as a one-character symbol № or composed of the letter N plus superscript "o" (sometimes underlined or substituted by the ordinal indicator, º), is common in Latin America, where the interpolated period is sometimes not used in abbreviations.
For singular ordinal numbers, shortened forms use the feminine (ª) and masculine (º) ordinal indicators, [6] rather than the superscript a and o, except in ordinal numbers ending in -er (only before masculine singular sustantives for ordinal numbers whose cardinal equivalent finishes in 1 and 3, except with the 11.º variant spelled undécimo).
) or the ordinal indicator (º). The masculine º or feminine ª ordinal indicator is acceptable in names, quotations, etc. from languages that conventionally use it. An Italian example: 313º Gruppo Addestramento Acrobatico not 313º Acrobatic Training Group or the 313º.