A square decameter (often abbreviated as dam²) is a unit of area in the International System of Units (SI). It represents a square with sides that each measure 10 meters (1,000 centimeters) in length.
One square decameter is equal to 100 square meters (m²) because each side of the square is 10 meters long, and when you square that length, you get 100 square meters.
Square decameters are not as commonly used as some other units of area, but they can be used to describe moderate-sized land areas, and they are a part of the metric system for measuring area.
In the context of land surveying and property descriptions in the United States, a "section" refers to a specific unit of land division. It is part of the Public Land Survey System (PLSS), which was established to survey and divide land in the United States, particularly in the western and central parts of the country.