A decameter is a unit of length in the metric system, equal to ten meters. It is often used in fields like surveying and agriculture to measure distances that are longer than a meter but shorter than a kilometer. The symbol for decameter is "dam." In practical terms, a decameter can be visualized as the length of a small sports field or the height of a three-story building. Understanding this measurement can help in various applications, such as calculating land area or determining the height of trees, which can be important in fields like forestry and land management.