The term 'Parts of a Staircase' can refer to the individual components that make up a staircase. These components include the steps, which are the flat surfaces that make up the treads and risers of the staircase, the balusters, which are the vertical posts that support the handrail, the handrail, which is the railing that runs along the side of the staircase, and the newel post, which is the large post at the base or top of the staircase.