Which architectural symbol indicates a door on a floor plan?

The symbol that indicates a door on a floor plan is typically represented by an arc. This arc shows the path of the door when opened, indicating its direction of swing. The use of an arc is practical because it allows designers and contractors to visualize not only the presence of a door but also how it interacts with the surrounding space in the layout.

In architectural drawings, clarity and simplicity are crucial for effective communication, and an arc effectively conveys the necessary information regarding a door's operational space without cluttering the design. This is essential for ensuring that spaces are planned efficiently, taking into consideration how doors will function within the overall layout. The choice of an arc is a standard practice in architecture and helps establish consistency in floor plan representations.