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A rack (sometimes called a triangle) is a piece of equipment that is used to place billiard balls in their starting positions at the beginning of a pocket billiards game. Rack may also be used as a verb to describe the act of setting billiard balls in their starting positions (e.g. "to rack the balls"), or as a noun to describe a set of balls that are in their starting positions (e.g. "a rack of balls", more often called a pack or a pyramid in British English). During the first World War, British authorities were slow to introduce grenades, with soldiers at the front improvising by filling ration tin cans with gun cotton, scrap and a basic fuse. Traditionally, the 1 ball is placed on the rack’s right corner, and the 5 ball on the left corner from the racker's vantage point to maximize contrast between the corner balls and the background, as the 1 and 5 are the brightest colored balls, however, the world standardized rules do not require this. However, all balls other than the 1 and 9 may be randomly placed. The balls should be pressed tightly together without gaps, as this allows the best break possible.

Unlike traditional racks, template racks are left on the table during the break shot and removed at the players' earliest convenience. Some players (most often amateurs) place the balls in numeric order but for the 9 ball; from the top of the triangle down and from left to right, i.e., the 1 on the foot spot, followed by the 2 then 3 in the second row, and so on. The 8 ball must be in the center of the rack (the second ball in the three-balls-wide row). In nine-ball games where a handicap is given by one player being spotted a ball, some tournament venues enforce a rule that the spotted ball must be racked as one of the two balls in the row directly behind the 1 ball. As you can see there are various ways you can scratch while playing pool and each one has its ownset of rulesand penalties assigned to it.

By 1925, the game was popular enough for the Brunswick-Balke-Collender Company to introduce purpose-made ball sets with seven red, seven yellow, one black ball, and the cue ball, which allowed spectators to more easily see which suit each ball belonged to. Straight pool is played to a specific number of points agreed on prior to the match's start, with each pocketed ball being worth one point to the shooter. Each of these actions scores a point, with the maximum score being 26 points. Because the game is played to a number of points normally far in excess of the fifteen points total available in the initial rack (in tournament play, one-hundred fifty points), multiple intragame racks are necessary. In the initial rack in straight pool, fifteen balls are racked in a triangular rack, with the center of the apex ball placed over the foot spot. The first ball must be placed at the apex position (front of the rack and so the center of that ball is directly over the table's foot spot). In nine-ball, the basic principles are the same as detailed in the eight-ball section above, but only balls 1 through 9 are used; the 1 ball is always placed at the rack's apex (because in nine-ball every legal shot, including the break, must strike the lowest numbered ball first) over the table's foot spot, and the 9 ball is placed in the center of the rack.

Diamond-shaped frames are sometimes used for the game of nine-ball (although a triangular rack can also be used) and template racks come in a variety of shapes. For this reason, template racks are almost never used for games where it is common to slow-break (i.e. not create a large spread of balls) since it is significantly more likely that the rack will interfere with slow-rolling balls. Purported benefits of template racks include a more consistent racking, and their popularity has warranted specific inclusion in profession rules. Triangular racks are used for eight-ball, straight pool, one-pocket, bank pool, snooker and many other games. Traditional racks are in the form of triangular frames, usually made from wood, plastic or metal. Some examples are coup fouetté ("whip shot"; a type of force follow); massé coulé (a massé shot with follow) and piqué (describes either a massé shot with no english, or a shot in which the cue stick is steeply angled, but not held quite as vertical as it is in full massé). Whether it is as match or an trick shot match. Skilled players thus often shoot cut shots with a small amount of outside english - gearing outside english - to neutralize the cut-induced throw that widens the shot away from the tangent line, though other techniques may be required instead or in combination with that, depending on the desired cue-ball position at the end of the shot.

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