Domino is a tile-based game that can be played with either polymer or wood tiles. The most common domino sets are made of bone, silver lip ocean pearl oyster shell (mother-of-pearl), ivory or a dark hardwood such as ebony, with black or white pips (inlaid or painted). Each tile has a line dividing it into two square ends, each marked with a number of spots called pips or dots. A set of dominoes with a matching pattern on all the pips makes up a dominoes set, also known as a deck or pack.
A domino set is used to play a variety of games with one or more players. Some games require that all tiles be in a certain position on the table, which is referred to as the line of play. Others are positional and require the player to place a domino edge to edge against another in such a way that the adjacent faces match or form a specific total.
When a domino is “set” or played down, it becomes part of the line of play and can no longer be moved. Some games have special rules for setting a double, called the lead. The first play of a domino with the lead may be made before any other plays. This tile is referred to as the lead, and the player making this play may be called the setter, the downer, or the leader.
Many dominoes are played with a special type of double, called a spinner. A spinner can be played on all four sides, but the most common use is to make a domino that will form a particular count, such as five to seven, when it falls. This type of double is not always the most valuable and is not always required in all games.
A domino is so powerful because it has potential energy, which is stored in its shape and mass. Once the potential energy is released by a nudge, it converts to kinetic energy, which pushes on the next domino and causes it to fall over. This continues down the line until the last domino falls, creating a chain reaction called the domino effect.
The term domino is often used to describe a domino effect in the political world, where one event can trigger other events that are difficult or impossible to stop. For example, the resignation of a politician or an economic crisis can have effects that are hard to predict and may be difficult or impossible to reverse.
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