Widescreen is often used as a nickname for the 16:9 aspect ratio of television screens. This means that if the television screen was sixteen inches wide it would have to be nine inches tall. Most 20th century television screen were 4:3 which means if it was four inches wide it would have to be three inches tall. In addition to these small screens, a screen could be any size with the same ratio. For example, a screen could be 32 inches wide and 18 inches tall and still be considered widescreen.