Final answer:
The part of the drawing indicating devices' relationship to each floor is the floor plan, which is an essential tool in architectural design for illustrating the layout of a building.
Step-by-step explanation:
The part of the drawing that shows the relationship of devices to each floor is called the floor plan.
An architect's floor plan for a house typically includes a detailed layout of each story, indicating walls, doors, windows, and fixed installations such as bathroom fixtures, kitchen cabinetry, and appliances. It may also include measurements, furniture, appliances, or anything else necessary to the purpose of the plan.
Floor plans are a critical tool in architectural design as they provide a bird's-eye view of the building and clearly illustrate how different spaces are laid out and connected. The numbering such as '1, 2, 3, 5' may refer to annotations or keys that explain different components or areas on the plan, making it easier to understand and communicate architectural ideas.