0 (number)
From The Art and Popular Culture Encyclopedia
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0 (zero) is both a number and the numerical digit used to represent that number in numerals. It plays a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, zero is used as a placeholder in place value systems. In the English language, zero may also be called null or nil when a number, "oh" , "goose egg", or cipher (archaic) when a numeral, and nought or naught in either context.
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