In your floor plan, the thin rectangles represent doors while the arc showcases the direction where doors would swing. Doors may look different on the floor plan depending on their forms and types. For example, pocket door floor plans are drawn as thin rectangles that disappear into walls, while sliding doors are drawn partially open alongside the wall. Double doors look like the letter ‘M’, with two curved lines meeting at the centre. In your floor plan, stairs are drawn as a series of rectangles. Stairs, bisected by a line with an arrow at one end in a floor plan, indicate the ascending stairs while landings are shown as larger rectangles or squares. House plans use stylised symbols, representing the outlines of elements they represent. Therefore, you would find symbols for appliances like refrigerator, stove, washing-machine, bathtubs, sinks, showers, toilets, drains, etc.