Long ton is a unit of weight measurement that is equal to 2,240 pounds. It is also called the Imperial ton or gross ton. However, there are other synonyms for long ton that are used in specific contexts. For instance, in the United States, long ton is commonly known as a measurement unit called the "tonne". Another synonym for long ton is the "metric ton", which is a unit used for international trade. Other synonyms for long ton include the "short ton" which is used in the US but is equivalent to 2,000 pounds, and the "ton of refrigeration" which measures the cooling capacity of air conditioning systems.