wind direction indicator (device)

noun
  1. A device used to show the direction from which the wind is blowing. Common types include weather vanes and windsocks, which are often used in meteorology and aviation to provide information about wind direction. noun
    The airport installed a new wind direction indicator to assist pilots during takeoff and landing.
    The farmer checked the wind direction indicator before spraying the fields to ensure the wind wouldn't carry the chemicals away.