mechanical device mechanism consisting of a device that works on mechanical principles
weathercock weathervane with a vane in the form of a rooster
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Wikipedia
A weather vane is an instrument for showing the direction of the wind. They are typically used as an architectural ornament to the highest point of a building. Although partly functional, weather vanes are generally decorative, often featuring the traditional cockerel design with letters indicating the points of the compass.
OmegaWiki Dictionary
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weather vane A movable device attached to an elevated object such as a roof for showing the direction of the wind.