A Quonset Hut is a type of round, prefabricated metal structure that was first developed during World War II by the United States military. While the term "Quonset Hut" is the most common way to refer to this type of building, there are a few other terms that can be used interchangeably. One such term is "Nissen Hut," which is named after British engineer Major Peter Norman Nissen, who developed a similar type of structure during World War I. Another term for a Quonset Hut is a "S-Model building," which refers to the rounded, S-shaped structure of the building.