How do you record a delivery if no pins are knocked down?

If no pins are knocked down during a delivery in Bowling, it is recorded as a "gutter ball" or a "zero." In the score sheet, you would enter a score of "0" for that delivery. Additionally, if it's the first delivery of a frame, leave the second delivery score blank, as it will still be recorded in the same frame. The next delivery will follow in the subsequent frame.