ladders and stepladders [3]
Movable devices of wood or metal, composed of rungs or steps and used to reach relatively high areas.
frame 
Parts supporting the steps and the platform of a platform ladder.
rubber tip 
Rubber part attached to the ends of the frame to prevent slipping.
safety rail 
Part serving as a support and protection barrier.
shelf 
Flat folding shelf upon which objects can be placed.
step 
Flat narrow surface that supports the feet when climbing, descending or standing.
stepladder 
Small ladder, often folding, that is usually composed of three to six steps.
step 
Flat narrow surface that supports the feet when climbing, descending or standing.
brace 
Folding cross piece maintaining the gap between the two opposite side rails, thereby providing stability.
top 
Flat top of a stepladder upon which objects can be placed.