Spiral staircase
… the outer side only, and on the inner side just the central pole. A squared spiral stair assumes a square stairwell and expands the steps and railing to a square, resulting in unequal steps (larger where they extend into a corner of the square). A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned screw-symmetrically.
Synonyms of spiral staircase
noun: stairway, stairs, ladder; plural: stairways, ladders, staircases; related terms: stair-case, …
Comment by robert: … down it was like a square staircase going down. i woke up …