What is a phantom line?

A phantom line is indeed a line that represents elements that are not directly visible in the drawings, which is crucial for conveying important information about a design. It is typically used in blueprints and technical drawings to illustrate items that may reference existing structures, features, or pathways but are not physically present in the current view.

This type of line helps architects, engineers, and construction professionals to understand the relationships between various elements within a project without cluttering the drawing with excessive detail. The visual representation of hidden or ancillary elements enhances communication and aids in accurate interpretation of the design intent.

The other options refer to different types of lines with specific functions, such as solid lines indicating visible elements, dotted lines often used to denote proposed changes or future constructions like walls, and lines representing property boundaries, which serve distinct purposes in architectural documentation.