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Upside-down marks, simple in the era of hand typesetting, were originally recommended by the Real Academia Española (Royal Spanish Academy), in the second edition of the Ortografía de la lengua castellana (Orthography of the Castilian language) in 1754 [3] recommending it as the symbol indicating the beginning of a question in written Spanish—e.g. "¿Cuántos años tienes?"
In English, the question mark typically occurs at the end of a sentence, where it replaces the full stop (period). However, the question mark may also occur at the end of a clause or phrase, where it replaces the comma (see also Question comma):
Irony mark as designed by Alcanter de Brahm in a French encyclopedia from 1905 [9] Another irony point (French: point d'ironie) was proposed by the French poet Alcanter de Brahm (alias, Marcel Bernhardt) in his 1899 book L'ostensoir des ironies to indicate that a sentence should be understood at a second level (irony, sarcasm, etc.). It is ...
This monoid is sometimes called the period-doubling monoid, and all period-doubling fractal curves have a self-symmetry described by it (the de Rham curve, of which the question mark is a special case, is a category of such curves).