A quantity whose value is imprecise, in contrast to an ordinary number. A fuzzy number is a number whose value is influenced by a set of numbers, which can produce many different outcomes. One analogy is driving a car on the highway. Even though the driver attempts to keep driving steadily at 65 miles per hour, the actual results will vary. If the speed were plotted each minute, there would be many different speeds, such as 63 mph, 67 mph, and 65 mphs. Fuzzy numbers are used in computer programming, engineering for communications products, and experimental science. Computer software and consulting companies increasingly are making use of fuzzy numbers.