The absolute value of a number is the distance (positive) of the number from zero.
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The only number whose absolute value is zero is zero. This is because a number's absolute value is its distance from zero on the number line.
The absolute value of zero is zero. The absolute value of any other real number - or even of any other complex number - is different from zero.
the absolute value
Absolute Value
If a number is zero or positive, then its absolute value is equal to the number.