Traditional Culture Encyclopedia - Photography and portraiture - In the figure, the distance between dimension line and the contour line should be 10 mm. What does the contour line mean?

In the figure, the distance between dimension line and the contour line should be 10 mm. What does the contour line mean?

In the figure, the contour line refers to the outer contour line of the drawn object, such as drawing the top view of the table in proportion, and the outermost solid line of the square table is the contour line, and the dimension should be marked at a distance of 10mm from the outer contour line of the table, as shown in the figure: