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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):
In mathematical formulas, the ± symbol may be used to indicate a symbol that may be replaced by either of the plus and minus signs, + or −, allowing the formula to represent two values or two equations.
The symbol has the Unicode code point U+20AA ₪ NEW SHEQEL SIGN.It has been in Unicode since June 1993, version 1.1.0. Under the Unicode bidirectional algorithm, typing the sign after the number will cause it to be displayed to the right of the number in any text directions.