What is the visual characteristic of a hidden line in engineering drawings?

The visual characteristic of a hidden line in engineering drawings is represented by short, evenly spaced dashes. Hidden lines are used to indicate features that are not visible from the current view, such as edges or outlines that are obscured by other components. This dashed representation helps differentiate these elements from other types of lines in the drawing, such as visible outlines or centerlines, which have distinct appearances.

Using short dashes allows for a clear representation of hidden features, making it easier for engineers and builders to understand the complete structure without cluttering the drawing with unnecessary details. This convention is widely accepted in technical drawing standards, aiding in effective communication within the engineering and manufacturing processes.