"nosing" refers to the protruding edge or lip of a stair tread or landing. It is the part of the tread that extends beyond the riser and is typically made of a different material, such as rubber, vinyl, or timber. The nosing provides a visual and tactile contrast, making it easier for people to identify and navigate stairs safely. It also helps to prevent slips and falls by providing a grip for the foot.

In Australian commercial construction projects, the term "nominal size" refers to the standard or typical size of a building component, material, or system, as opposed to its actual or precise dimensions. Nominal sizes are used for convenience and consistency in design, specification, and procurement.

Nogging or "noggin" refers to horizontal bracing pieces, typically made of timber or metal, that are installed between vertical studs in a wall frame. The primary purpose of noggings is to provide lateral support to the studs, helping to prevent them from twisting or buckling and to increase the overall rigidity and stability of the wall structure. Noggings also offer additional support for attaching fixtures, such as cabinets or wall linings. The spacing and size of noggings can vary depending on the specific requirements of the construction project and the load-bearing needs of the wall.

"newels" refer to the vertical posts that support the handrail of a staircase. They are critical components in the design and structural integrity of staircases, providing both support and aesthetic appeal. Newels are typically found at the beginning, end, and any intermediate points of a staircase where there is a change in direction or a landing. They can be made from various materials, including wood, metal, or concrete, depending on the design requirements and the overall architectural style of the building. In commercial settings, newels must comply with specific building codes and standards to ensure safety and durability.

A "natural finish" typically refers to a surface treatment or appearance that maintains the inherent characteristics and aesthetics of the material being used. This can apply to a variety of materials, such as wood, stone, concrete, or metal. The goal of a natural finish is to preserve the original look and feel of the material, often highlighting its texture, color, and grain patterns without altering them significantly through artificial treatments.