What is a weather instrument that measures wind direction and is often seen on the roofs of buildings or at airports?

<p style=";text-align:left;direction:ltr">Arab Weather - The device that measures wind direction and is often seen on the roofs of buildings or in airports is the wind vane or wind indicator (Wind Vane). This device works to determine the direction from which the wind is blowing, and is usually installed in a high place to ensure that it is not affected by any obstacles.</p>