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The term "coaster" most commonly refers to a drink coaster, but it can also refer to a roller coaster. Here is a description of both:. Drink Coaster (or Beverage Coaster)In bars, a coaster placed on top of a drink can indicate that the drink is unfinished.They can prevent contamination, such as from insects, when placed over a glass.They are often used for advertising or as decorative items that add to the room's aesthetic.