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A heavy line with end arrows marking where a section is taken.
Also known as: Section line symbol, Cutting plane line, Section marker symbol
On an architectural plan a heavy line with arrows at each end marks where a section is cut through the building, the arrows showing the direction the section looks.
Marks the plane on which a section drawing is cut and the direction in which it is viewed.
Contexts: Technical drawing
Carries the direction of view, without which a section cannot be matched to the plan: the same cut viewed the other way is a different drawing.
Contexts: Technical drawing
A heavy broken line across the plan with a short arrow turned at right angles at each end, each labelled with a letter.