It means that the number is zero or more, just not less than zero.
"Positive" means more than zero.
"Non-negative" means either zero or else more than zero.
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The absolute value of a number is always nonnegative.
True
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52. The absolute value is the nonnegative value of a number. Enclosing vertical bars ( | | ) are the absolute value operator. Using that notation we can state that |a| = a, and |-a| = a. You can also note that |a| (whether a is negative or positive) equals the square root of a squared.
The set of nonnegative integers is the set {0, 1, 2, 3, 4, 5, 6, ...} Each number in this set is an "example".