Wind vane is a simple device that is used to monitor and detect wind direction over time. Wind vanes were used from ancient times, when they were usually put on the top of a roof. The most usual form was in form of rooster. The modern wind vanes are more sophisticated and they are based on electromagnetic principle, where electronic signals can be sent through sensors to a computer device with a proper software that will help to assess and record the wind variations during different seasons. Many companies use wind vanes, besides the weather stations, tall buildings, ports, towers and other structures are also equipped with wind vanes.
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http://en.wikipedia.org/w/index.php?title=Weather_vane&redirect=no
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