The vertical part of a step is called the "riser." The riser is the part of the staircase that connects one step to the next, creating a vertical barrier between each step. This vertical component is essential for providing stability and support while climbing or descending stairs. In architectural terms, the riser plays a crucial role in determining the overall design and functionality of a staircase. It helps to maintain the proper height and depth of each step, ensuring safe and comfortable movement between different levels of a building. The height of the riser is typically regulated by building codes to ensure that stairs are safe and easy to use. The standard height for a riser is around 7 inches, but this can vary depending on local regulations and the specific requirements of a building. In addition to providing structural support, the riser also contributes to the aesthetic appeal of a staircase. It can be designed in a variety of styles and materials to complement the overall design of a building. From traditional wooden risers to modern glass panels, there are endless possibilities for customizing the look of a staircase. For more information on the vertical part of a step and how it contributes to the overall design and functionality of a staircase, check out this informative article on stair design principles: [https://www.architecturaldigest.com/story/stair-design-principles](https://www.architecturaldigest.com/story/stair-design-principles). In conclusion, the riser is an essential component of any staircase, providing both structural support and aesthetic appeal. By understanding the role of the riser in stair design, architects and builders can create safe, functional, and visually appealing staircases that enhance the overall design of a building.

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