It is called the absolute value of the number.
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The absolute value
The distance from zero on a number line is called the absolute value.
Yes, because the distance is a metric which is defined in that way.
absolute value
0 isn't a real number. Distance: the extent or amount of space between two things, points or lines. 0 is not a amount as it is not a number and is the "Distance" were to be 0 then it wouldn't be any leanth away.