What is "bank pool"

n. A form of pool (pocket billiards) in which all score shots are made by banking a called ball off a cushion and into a called pocket.

Bank pool is a pool (pocket billiards) game that has as its most fundamental requirement that all scoring shots in the game must be made by a called ball off a and into a called pocket. While the game has multiple variations, the predominant version through much of its history was played with a full fifteen-ball , of which the winning player was required to legally pocket eight balls. A shortened version of the game using nine balls of which the players must legally pocket five for the win, often called "nine-ball banks," gained popularity in the 1990s and 2000s and is the subject of international professional competition and televised matches.