Party props are items used to decorate a party or event. The term 'party prop' can refer to a variety of items, such as balloons, streamers, banners, and confetti. In this particular crossword, the solution for the term 'party prop' is BALLOON, which is a popular item used to decorate parties and events. Balloons come in a variety of shapes, sizes, and colors, and can be filled with air or helium. They are often used to create a festive atmosphere and can be used to decorate tables, walls, and ceilings.