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• n  a stabilizer that is part of the vertical tail structure of an airplane
• n  one of a pair of decorations projecting above the rear fenders of an automobile
• n  the tail of fishes and some other aquatic vertebrates

• vertical stabilizer
• vertical stabiliser
• vertical fin
• tailfin
• fin
• caudal fin

News & Articles

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• Ryanair Is Going To Start Plastering Ads On Its Planes To Make Money
  With four possible ad locations to choose from — Ryanair will keep its own logo on the tail fin — spokesperson Robin Kiely told potential partners this offer "ensure[es] their brand is featured on Europe’s largest – and cheapest – outdoor advertising medium."
  July 18, 2013 - Business Insider