A wind or weather vane is an instrument that can have different designs, such as a horse, cockerel, pointing arrow, and lettering that indicate the different compass points. People usually place these instruments on top of roofs.
Likewise, wind socks are instrument that visually indicate the wind’s direction at airports and seaports. With this device, wind enters the sock’s larger end to indicate the direction. A wind sock’s movement and shape also can show wind strength.
These devices might be used in conjunction with an anemometer, which measures wind speed.Learn more about Measurements