riser
staircase
Quick Summary
A "riser" is a term with multiple meanings. In the context of a staircase, the riser is the vertical part between two treads. An "open riser" refers to the space between adjacent stairs when there isn't a solid riser closing it off. A staircase itself is a series of steps connecting two floors. Historically, staircases were often enclosed by walls, with early examples found in ancient structures like Egyptian pylons and Roman theaters. Modern materials like steel and reinforced concrete allow for more elaborate designs.123
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