Alphabet of Lines

1.
Phantom Line

2.
Section Line

3.
Cutting-plane Line

4.
Leader Line

5.
Hidden line (Thread Sym,)

6.
Hidden Line

7.
Center Line

8.
Exstention Line

9.
Break Line

10.
Visible Object Line

11.
Break line, (freehand)

12.
Dimension Line

1.
Short break

2.
Construction lines

4.
Center line

5.
Hidden line

6.
Object line

7.
Section line

8.
Long break

9.
Extension line

10.
Dimension line

11.
Leader lines