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Wedge-shaped treads radiating around a centre.
Also known as: Helical stair plan symbol, Circular stair symbol
On an architectural plan a spiral stair is drawn as wedge-shaped treads radiating from a central column, with an arrow marking the direction of ascent.
Denotes a stair whose treads radiate around a central column.
Contexts: Technical drawing
Shows treads of varying width, which is why the going is measured at a defined point along the tread rather than at its edge.
Contexts: Technical drawing
A circle divided into narrow wedges by lines radiating from a small central circle, with an arrow curving around them.