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A zeroid is, in mathematics, a zero identity.

Zero plays the role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures.

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In mathematics, it is called an identity.

An Identity element in multiplication is one that when you multiply a value by the identity element, that the original value is returned. The only identity element in multiplication is 1. If you multiply any value (other than infinity which is a special case of mathematics), the value returned will be 0. The identity element for addition is 0.