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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. In English orthography, this corresponds to the suffixes ''-st, -nd, -rd, -th'' in written ordinals (represented either on the line ''1st, 2nd, 3rd, 4th'' or as superscript, ''1st, 2nd, 3rd, 4th''). Also commonly encountered are the superscript (and often underlined) ordinal indicaters ''a'' and ''o'', originally from Romance, but via the cultural influence of Italian by the 18th century widely used in the wider cultural sphere of Western Europe, as in 1º ''primo'' and 1ª ''prima'' "first, chief; prime quality". The practice of underlined (or doubly underlined) superscripted abbreviations was common in 19th-century writing (not limited to ordinal indicators in particular, and also extant in the Numero sign №), and was also found in handwritten English until at least the late 19th century (e.g. "first" abbreviated ''1st'' or ''1'').〔see Max Harold Fisch, Christian J. W. Kloesel, "Essay on the Editorial Method", in ''Writings of Charles S. Peirce: 1879-1884'', vol. 4 (1989), (p. 629 ): "Peirce also regularly used the nineteenth-century calligraphic convention of double underlining superscript portions of abbreviations such as M or 1."〕 ==Superscript ''o'' and ''a''== In Italian, Spanish and Portuguese, the suffixes ''o'' and ''a'' are appended to the numeral depending on whether the grammatical gender is masculine or feminine respectively. As with English and French orthographical tradition, the suffixes are traditionally superscripted. In addition, they are often underlined too, as in 1º ''primo'', 1ª ''prima''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ordinal indicator」の詳細全文を読む スポンサード リンク
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