Negative and non-negative numbers

A negative number is a number that is less than zero, such as −3. A positive number is a number that is greater than zero, such as 3. Zero itself is neither negative nor positive, though in computing zero is sometimes treated as though it were a positive number. The non-negative numbers are the real numbers that are not negative (positive or zero). The non-positive numbers are the real numbers that are not positive (negative or zero).

Related Topics:
Number - Less than - Zero - Real number

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In the context of complex numbers positive implies real, but for clarity one may say "positive real number".

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