The term 'Arctic Dwelling' refers to dwellings that are built in the Arctic region. The two most common types of Arctic dwellings are iglu and igloo, both of which have four and five letters respectively. An iglu is a type of shelter made from blocks of snow or ice, while an igloo is a dome-shaped dwelling made from blocks of snow or ice. Both types of dwellings are used by the indigenous people of the Arctic region for protection from the cold weather and other elements.