Bed warmer
（重定向自Bedwarmer）
A bed warmer was a common household item in countries with cold winters, especially in Europe. It consisted of a metal container, usually fitted with a handle and shaped somewhat like a modern frying pan, with a solid or finely perforated lid. The pan would be filled with hot coals and placed under the covers of a bed, to warm it up and/or dry it out before use.