America's Cup: What's a poster?
Americas Cup: Whats a poster? by Australian Sailing/John Curnow 8 Mar 23:21 GMT Luna Rossa and Emirates Team NZ - Waitemata Harbour - January 6, 2020 - 36th Americas Cup © Richard Gladwell / Sail-World.com Historically, it was predominantly an A1 sized piece of paper, with a four-colour printed image of a sports hero, favourite band, model, movie or legend on it. You had to go to a specialist shop to get one, too, although some smaller ones were in more mundane publications...
Source: yachtsandyachting.com