wichita.edu
…in length, consisting of one section. Side rails --- The side members joined at intervals by rungs, steps, cleats, or rear braces. Step stool (ladder type) --- A self-supporting, foldable, portable ladder, non-adjustable in length, 32 inches or less in size, with flat steps and without a pail shelf, designed so that the ladder top cap as well as…
https://www.wichita.edu/services/environmental_health_and_safety/Safety/ladder_safety_program.php