EDP
solid thick lines that represent visible edges or contours
visible lines
short evenly spaced dashes that depicts hidden features
hidden line
solid thin lines that indicate cut surfaces
section lines
alternating long and short dashes
center lines
give the three dimensioning
dimension extensive and leader line
solid thin lines showing dimension extent or direction
dimension line
solid thin lines showing point or line to which dimension applies
extension line
direct notes dimensions symbols part numbers etc to feature on drawing
leader lines
indicate location of cutting pains for sectional views and the viewing position for remove partial views
cutting plane and viewing plane lines
indicate only portion of object is drawn may be random squggled line or thin dashes joined by zigzag
break lines
long thin dashes separate by pairs of short dashes indicate alternate position of moving parts adjacent position of related parts and repeated detail
phantom lines
lines or surface with special requirements
chain line