The term 'Vertical Billiards Stroke' is a type of shot in the game of billiards. It is also known as a 'Masse' shot, which is a French word meaning 'MASS' or 'WEIGHT'. The Masse shot is a powerful shot that requires the cue ball to be struck with a large amount of spin and force, causing it to curve around an obstacle and hit the target ball. This shot is often used to clear a path for the cue ball to reach the pocket.