It is the additive identity of most sets of "ordinary" numbers.
Division by zero is not defined.
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There is no known mathematical symbol for zero in the ancient Egyptian number system.
Some examples of zero integers are 0, -0, +0. Zero is considered an integer because it is a whole number and can be represented on the number line.
These are also known as natural numbers or positive integers. Note: some authors consider zero to be a natural number and one can make a good case for this position.
Number line is a 2-D figure on which all the real numbers are marked. The centre point is considered as zero. It extends to infinity.
The number, 0 is nothing, so some number + 0 is that number.