The term 'staircase decoration' can refer to a variety of decorative items used to enhance the look of a staircase. The crossword solution for this term is 'RUNNER, ' which is a type of rug or carpet that is placed on the stairs to provide a decorative touch. Runners are typically long and narrow, allowing them to fit perfectly on the steps of a staircase. They come in a variety of colors, patterns, and materials, making them a great way to add a unique touch to any staircase.