The crossword solution for the term 'Piece of Disney Memorabilia' is CEL, which stands for celluloid. Celluloid is a type of plastic that was used to make animation cels in the early days of Disney animation. Animation cels were transparent sheets of celluloid on which animators drew characters and backgrounds for animated films. They were then photographed one frame at a time to create the illusion of movement. Today, these cels are highly sought after by Disney fans and collectors.