An instrument used to measure the speed of the wind is called an anemometer. This device often consists of rotating cups or blades that catch the wind, providing a mechanical measurement of wind speed. Anemometers come in various types, including cup, vane, and hot-wire anemometers, each utilizing different principles to measure wind velocity. They are widely used in meteorology, aviation, and environmental studies. By helping to monitor wind conditions, anemometers play a vital role in weather forecasting, research, and even designing structures to withstand wind forces.