What symbol is used on plans to indicate a door's direction of swing?

• A. Arc
• B. Arrow
• C. Swing line
• D. Door swing symbol

Answer: (A)

The symbol used to show a door’s movement on plans is the swing arc. This curved line represents the door’s path as it opens, anchored at the hinge side, so you can tell which way the door swings (in or out) and on which side the hinges are located. The door itself is typically drawn as a straight line in the closed position, with the arc indicating its travel. For double doors, you’d see two arcs showing both leaves. This arc is the standard, clear way to convey door swing on plans, more descriptive than a simple arrow or a generic label.