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0（零／〇）是代表“空量”（无）的一个数。0是-1与1之间的整数，属于偶数，其既不是正数也不是负数。
0是大多数记数系统的位值记号，同样作为占位符数字使用。这种用法起源于印度数学，中世纪时经伊斯兰数...