The common name for a device used to measure wind speed is called an anemometer. Anemometers come in various types, but the most common design is the cup anemometer, which consists of three or four cups mounted on horizontal arms. As the wind blows, it causes the cups to rotate, and the speed of rotation correlates with wind speed. Anemometers are widely used in meteorology, aviation, and marine settings to assess weather conditions and inform safety protocols. They play a crucial role in understanding atmospheric phenomena and are essential tools for weather forecasting and research.