The term squirrel cage is commonly used to describe a specific type of fan or motor that contains a rotating cylinder made up of bars or vanes. This design is known for its durability and efficiency, but there are also other synonyms that can be used to describe this type of equipment. Some of these include centrifugal fan, blower wheel, wheel fan, paddle fan, and backward curved fan. Each of these terms can be used interchangeably to describe the same type of device, but they may also have slightly different applications or characteristics depending on the specific design and use case.