Baluster/Spindle – the vertical member, plain or decorative, that acts as the infill between the handrail and baserail (or tread if open stringer).

Closed Stringer – a stringer with the face housed/trenched to accommodate treads and risers so their profile cannot be seen from the side.

Continuous Handrail – using straight lengths of handrail connected to handrail components, the handrail flows over the tops of turned posts creating a continuous run of handrail.

Horizontal Guard Rail – a section of railing installed to protect occupants from falling through the stairwell or off a balcony to the lower level.

Open or Cut Stringer – a stringer with the upper edge cut away to the shape of the treads and risers so that their profile can be seen from the side.

Newel Post – larger posts that anchor the rail at corners and at an end.

Nosing – the edge of the tread projecting beyond the face of the riser and the face of a cut stringer.

Rise – the rise of a flight is the vertical distance between the floors or landings connected by the flight. The individual rise is the vertical measurement from top of tread to top of the next tread.

Riser – the vertical board that forms the face of the step.

Staircase – the entire structure relating to a stair, comprising steps, treads, risers, stringers, balustrading, landings etc.

Stairwell – the space/void provided for the stairs.

Tread – the top or horizontal surface of a step.

Wall Rail – a handrail that is mounted to the wall with brackets

Winders – are radiating steps narrower at one end that are used to change the direction of a stairs through 30°, 60° or 90°.