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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?"
Ella me pregunta «¿qué hora es?» – 'She asks me, "What time is it? " ' Question marks must always be matched, but to mark uncertainty rather than actual interrogation omitting the opening one is allowed, although discouraged: [15] Gengis Khan (¿1162?–1227) is preferred in Spanish over Gengis Khan (1162?–1227)
The check mark is a predominant affirmative symbol of convenience in the English-speaking world because of its instant and simple composition.
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.