Main ball: the player directly hits with the club from beginning to end, and uses the power of the ball to hit the ball scored by other balls. This ball is called "cue ball" or "cue ball". Snooker and American billiards use the same white ball as the main ball, three-ball bag billiards and four-ball impact billiards use a white ball as the main ball, the first player uses a white ball with black spots as the main ball, and the second player uses a white ball without black spots as the main ball. Target ball: All the balls that an athlete can hit directly with the main ball are target balls. Three-ball snooker and four-ball impact billiards are all target balls except the main ball. Snooker and American billiards, the target ball of each shot is changing. Batter: A person who is about to hit the ball or is hitting the ball is called a "batter". He has been a batter until the end of a stroke or a ball, that is, before the referee declares "missed opportunity" or "foul". One shot: Any batter who hits the main ball with the leather head at the top of the club, whether it is scoring, fouling or missing the ball, is called "one shot". If you hit the cue ball again after scoring, it will be regarded as the next shot. Strike: The batter scores the first strike, scores the second strike, and scores continuously until he misses or fouls, which is called a "strike". Disk: From the kick-off until all the balls are shot down or reach the specified score or time limit, it is called "disk". Game: It is stipulated by the organizer at the beginning of the game or agreed by both sides of the game that several games are one game, and each game can only play one game, and it can also win two of three games or three of five games. Field: It is stipulated by the organizer at the beginning of the game or agreed by both sides of the game. For example, a game can be defined as best of five games or best of nine games. Ball in the game: When the game starts, any ball that stays on the table or moves on the table is a ball in the game. Kick-off: The first shot of the first player to hit the main ball is kick-off, which is the beginning of the game in this bureau. Missed Opportunity: Although the batter hit a target ball with the main ball, but failed to score, or fouled, it is considered to have missed the opportunity. At this time, the opposing player should replace the bat. Foul or violation: any violation of the rules of the game is regarded as a foul or violation, but it must be decided by the referee to be effective. Empty shot: When the batter hits the main ball without hitting any target ball, it is called "empty shot" and it is a foul. Pusher: The batter hits the cue ball to make it move forward. When hitting the target ball, the club head does not leave the contact with the cue ball, which is equivalent to pushing the two balls together, which is called "putter". In other words, instead of hitting the cue ball, the cue ball is pushed out, similar to holding the ball in volleyball. The putter is a foul. If the main ball is almost in contact with the target ball, it is considered normal to let the main ball brush the target thinly or hit the ball with the stick point technique. Combo: In the process of hitting the ball, the club head hits the main ball more than twice, which is called "combo" and is a foul. Out of bounds: Any ball that hits the ground or stops at the edge of the table is called "out of bounds" and is a foul. Mishit: A batter mistakenly hits another ball as his cue ball, which is called "accidental hit" and is a foul. Eccentricity: hitting both sides of the cue ball with a club is called eccentricity, hitting the right side of the cue ball is called eccentricity, and hitting the left side of the cue ball is called eccentricity. The eccentric rod can make the main ball rotate laterally. Pull rod: After the main ball hits the target ball, it moves laterally to the left or right, which is called "pull rod". Retraction: After the cue ball hits the target ball, the target ball moves forward and the cue ball moves backward, which is called "retraction". Following the ball: After the main ball hits the target ball, the target ball moves forward and the main ball follows, which is called "following the ball". Pull rod: When hitting the ball, the club is almost perpendicular to the table, hitting the main ball from top to bottom to make the main ball rotate strongly, which is called "pull rod". Some shots: When the distance between the main ball and the target ball is less than the diameter of a ball, hit the center of the main ball in order to avoid putting. When the club head hits the cue ball, the cue will be quickly retracted, the target ball will move forward after being hit, and the cue ball will return to its original position. This method of hitting the ball is called "point shooting". Walking: After hitting the target ball with the main ball, the batter makes the main ball or the target ball move to the required position according to his own will. This action is called "walking the ball". Sticking ball: The main ball sticks to one or two balls without gap, which is called "sticking ball". When the ball is stuck, it must be decided by the referee. Various billiards rules have different ways to deal with the ball. Table: It is the horizontal part of the table. On the absolutely flat and very smooth bluestone board, the table is covered with standard woolen cloth, and the table is surrounded by a frame higher than the table to ensure that billiards can roll freely within this range. Desk edge (also known as "bank"): It is a frame around the desktop that is higher than the desktop, and it is inlaid with standard elastic rubber strip. The table edge facing the front of the tee area is called the top table edge or top dike, the table edge behind the tee area is called the bottom table edge, the right table edge is called the right table edge, and the left table edge is called the left table edge. Bag: There are six bags in the middle of the four corners and two sides of the table for snooker, English billiards and American billiards, which are used to catch falling balls. Put the ball: When the ball kicks off, falls into the bag and goes out of bounds, the place where it needs to be put is called "put the ball". Occupation: The designated landing point is occupied by other balls, which is called "occupation". At this time, it can be handled according to regulations. Triangular Rack: It is a special tool for snooker and American sixteen-color balls to place ball piles. Before tee-off, all the balls should be placed in a regular triangular pile and neatly placed in the designated position on the table. Only by using this mold can the specified requirements be achieved.