Final answer:
In tenpin bowling, knocking down all the pins after your second bowl is called a spare.
Step-by-step explanation:
In tenpin bowling, when you knock down all the pins after your second bowl, it is called a spare. A spare is achieved when all the pins are knocked down with two bowls. It is represented with a slash (/) in the scoring system.
For example, if you knock down 7 pins with your first bowl and then knock down the remaining 3 pins with your second bowl, you would have achieved a spare.