Templates have pre-dimensional holes that are in the right scale, so engineers can accurately draw a specific symbol or sign. Letter templates can be used to draw text (such as digits and letter characters), while others can be used to draw circles and arcs. Circle templates will have a set of holes that have been sized in a suitable manner, but there are others that can be used to draw other geometric shapes (such as squares, ellipses, and many other specialized objects) that can be used for any number of purposes. Some of them also include French curves, which can be used to draw smooth curves at a specific reference point.