Blonde Girl On Stairs Wearing Black Undergarments

The railing system
The balustrade is the system of railings and balusters that prevents people from falling over the edge.
• Banister, Railing or Handrail
The angled member for handholding, as distinguished from the vertical balusters which hold it up for stairs that are open on one side; there is often a railing on both sides, sometimes only on one side or not at all, on wide staircases there is sometimes also one in the middle, or even more. The term "banister" is sometimes used to mean just the handrail, or sometimes the handrail and the balusters or sometimes just the balusters.