This means that the airline / alliance shown has a few different flights available for a similar price and the same number of stops. (upgradedpoints.com)
You can use controls on the left sidebar to filter results by number of stops, departure or arrival time, total travel duration, and airline. (upgradedpoints.com)
For example, a person travelling from town A to town B can make an infinite number of stops. (sciencedaily.com)