When implementing a computer system using this kind of number as the base, allowances must be made for the fact that their integer division is often rounded to zero. In Python, passing one of these numbers as the index argument of a list will return an element selected from the end of the list. In the twos-complement system, these numbers are preceded by a one; thus, a one followed by a series of zeroes can represent this kind of zero. Overflow errors can occur when a variable exceeds the maximum possible value and rolls over to one of these. For 10 points, name this kind of number contrasted 
When implementing a computer system using this kind of number as the base, allowances must be made for the fact that their integer division is often rounded to zero. In Python, passing one of these numbers as the index argument of a list will return an element selected from the end of the list. In the twos-complement system, these numbers are preceded by a one; thus, a one followed by a series of zeroes can represent this kind of zero. Overflow errors can occur when a variable exceeds the maximum possible value and rolls over to one of these. For 10 points, name this kind of number contrasted with a positive number, one that is less than zero.
When implementing a computer system using this kind of number as the base, allowances must be made for the fact that their integer division is often rounded to zero.
{negative} numbers [or {negative integers}]