Final answer:
In bowling, when the 4 and 6 pins are the only ones remaining after the first throw, it is called a 'sleeper,' a term describing the challenging diagonal spare setup of these pins.
Step-by-step explanation:
When the 4 and 6 pins are left standing after the first ball in bowling, it is commonly referred to as a "sleeper." This situation occurs when the ball knocks down every pin except for two that are in a diagonal position from each other, making it a challenging spare to pick up for the bowler. In this scenario, the 4 pin is in the back row of the pins and may not be visible from the angle of the approach due to being directly behind the 6 pin.