| A | B |
|---|
| A collection of the different lines used in drafting with classifications for line weight and line type. | Alphabet of Lines |
| the heaviest line around the edge serving as a frame for the drawing and establishing space between the drawing and the edge of the paper | Border Lines |
| Thin lines made up of long and short dashes with spaces in between to indicate the centers of round objects | Centerlines |
| Very light lines used as guides for positioning objects on drawings | Construction Lines |
| Heavy dashed lines used to show sectional views. Arrows are extended from the endpoints to illustrate the viewing direction | Cutting-plane Lines |
| Shows the actual distance on a line with a number break in the middle and terminates in arrowheads at the end. | Dimension Lines |
| Two points equal distance apart | Equidistant |
| Light lines used to project dimension lines to specific points on an object | Extension Lines |
| A network of uniformly spaced points used to determine distances to help show placement of an object | Graph method |
| Very light line used with lettering to help keep the lettering a uniform heights. | Guidelines |
| lines that indicate or show the hidden features of a part that isn’t visible from the viewer’s point of view | Hidden Lines |
| A straight line. | Linear |
| heavy lines that show the visible edges and intersections of an object also called visible lines | Object Lines |
| show alternate positions of a moving part, repeated details, or the path of motion of an object | Phantom Lines |
| Used to indicate the center of a round object in the primary or true-shape view. | Primary centerline |
| A 90-degree angle. The angle is formed by lines that are perpendicular to one another. | Right Angle |
| made up of alternating long and short dashes to center on other views of object and should extend through the round object. | Secondary centerline |
| Thin lines showing the exposed surface planes Lines are drawn using patterns corresponding to different materials | Section lines |
| Quick way to show an idea that would be difficult to describe with words alone and to draw without the aid of drafting instruments. | Sketching |
| Long and short dashes that locate the center of symmetric object. | Symmetry Centerline |
