It's an antenna rotater display.My size is XL T: if you're not part of the solution Abusive comment hidden. (Show it anyway.)
It appears to be an Italian ship builders nail. Note how it gently curves around to unite the planks and keep them tight. It's true... Honest... Look it up! Abusive comment hidden. (Show it anyway.)
My size is XL T: if you're not part of the solution