Looks like the mast and a sail of a sailing ship. If the sail was just an outline of metal with a single foot step at the bottom. Attached to a playground. So really nothing like a mast and a sail of a sailing ship. My bad.
Apparently a squiggle pole and another squiggle pole together make a double squiggle ladder. It's got S-shaped squiggles on two planes. Snakes on (two) planes!
It's a half circle ladder but the sides keep switching. Or - to put it another way - two vertical poles with half circle arcs as steps and the arcs alternate sides.
A ladder created by two poles that curve from the ground to the platform where the rungs are slight curved and includes curving handrails. There is also a small black belt segment.
A climbing element created by metal circles that look a bit like bubbles. I support they are technically alternating arcs because they aren't complete circles.
