The number "−5" is a negative integer that represents a value five units less than zero. In mathematics, negative numbers are used to indicate values below zero, often in contexts such as temperature, debt, or elevation below sea level. In the context of the number line, "−5" is located to the left of zero. It is part of the set of integers, which includes positive numbers, negative numbers, and zero. Negative integers like "−5" can be used in various calculations, such as subtraction and addition, to represent loss or decrease in quantity.