| A | B |
|---|
| center line | a line consisting of a long dash followed by a short dash, that is used to show and locate the centers of arcs and circles, and to describe the center axis of a cylindrical form. |
| detail | shape or feature on a model. |
| dimension line | thin line segment capped on the ends with arrowheads, that indicate the length of the dimension. |
| dimensioning | the process of placing measurements and notes on a drawing to completely communicate its meaning. |
| extension line | thin lines used to establish the extent of a dimension. |
| feature | any physical porting of an object, such as a hole or fillet. |
| line weight | the width and darkness of a line. |
| mass | the property of an object that is a measure of its inertia, the maount of matter it contains, and its influence in a gravitational field. |
| order of views | the relationship between the views in orthographic projection. |
| orthographic | right angle projection. The views of an object are drawn in perpendicular planes to one another. |
| pencil types | measured by the softness of the lead. |
| projection plane | an imaginary plane in the line of sight on which an image appears. |
| proportion | a principle of design. Comparative relationships between things with respect to size. |
| views | the different viewing perspectives found in mechanical drawing. |
