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Zero is the integer denoted 0 that, when used as a counting number, means that no objects are present. Get the definition and interesting zero facts and learn about its history and role … 0 (zero) is a number representing an empty quantity. While mathematicians all accept zero as a number, some non-mathematicians would say that zero is not a number, arguing … · learn about the number zero. It is the only integer … Adding (or subtracting) 0 to any number leaves that number unchanged; The meaning of zero is the arithmetical symbol 0 or [symbol] denoting the absence of all magnitude or quantity.