weather vane
From Longman Dictionary of Contemporary EnglishRelated topics: Household, Meteorology, Geographyweather vaneˈweather vane noun [countable] DHWEATHERa metal object fixed to the top of a building that blows around to show the direction the wind is coming fromExamples from the Corpusweather vane• The strange, fixed weather vane that stands in the lee of the vicarage at Rennes-le-Chateau.