Jisho

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(食器)
Wikipedia definition
1. Beverage coasterA coaster, drink coaster, beverage coaster, or beermat, is an article used to rest beverages upon. The main purpose is to protect the surface of a table or any other surface where the user might place their beverage. Public houses usually will have beermats spread out across the tables. They are used not just to protect the surface of the table, but, as they are usually made of paper, they can also be used to absorb condensation dripping along the glass or serve as an ad-hoc notepad.
Read “Beverage coaster” on English Wikipedia
Read “コースター (食器)” on Japanese Wikipedia
Read “Beverage coaster” on DBpedia

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