Wind direction indicators are tools used to measure the direction of the wind. The two most common wind direction indicators are a SOCK and a VANE. A SOCK is a fabric tube that is attached to a pole and is used to measure the direction of the wind by the way it moves in the wind. A VANE is a flat plate mounted on a pole and is used to measure the direction of the wind by the way it is pushed by the wind. Both of these tools are important for measuring wind direction and can be used in a variety of applications.