A staircase in the form of a helix.

(rare, idiomatic) Thinking of an idea or course of action too late to use it effectively, or the tendency to do so.

plural of staircase lock

A set of locks on a waterway canal which rise steeply, and consisting of lock gates where the top gate of one lock is also the bottom gate of the next lock, not having a pound between each level.

An impossible loop of endlessly ascending and descending stairs, or an optical illusion appearing to be one.

(mathematics, informal) Synonym of Cantor function; a type of monotonic increasing function.

A waterfall in Wassen Creek, Devil’s Staircase Wilderness, Siuslaw National Forest, Oregon, United States; a multi-tiered low cascading waterfall.

An escalator.

(UK, obsolete, idiomatic, slang, historical) A prison treadmill.