are also known as "Line symbols, ALPHABET OF LINES , Thick dark line use to show outline of object, visible edges and surfaces. , , Very light and thin line use to construct layout work., , Thin and dark lines use to show the size (span) of an object with a numeric value., , Short dash lines use to show non visible surfaces that are not visible in an orthographic view., , Long and short dash lines. Usually indicates center of holes, circles and arcs., , Thin and dark line use to show the starting and ending of dimension., , Extra thick lines use to show cutaway views or plane of projection where a section view is taken. , , Medium line with arrowhead to show notes or label for size or special information about a feature. , , Long line followed by two short dashes use to show alternate position of a moving part. , .

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