Used to indicate the parts of a drawing to which a note
LEADER LINE
Used to indicate of all visible edges of an object.
VISIBLE LINE
Solid lines terminated by arrowheads at both ends to show the directions and extent of a dimensions. It contains measurement.
DIMENSION LINE
Used to indicate alternate position from moving parts, adjacent position of related parts and repetitive detail.
PHANTOM LINE
Used to show breaks of small objects.
SHORT BREAK LINE
Used to designate where imaginary cutting took place.
CUTTING PLANE LINE
Used to indicate the surface in section view imagined to have been cut along the cutting plane line.
SECTION LINE
Used to show the center of holes and symmetrical features.
CENTER LINE
12.olid line with z symbol inserted in several paces of the line used to reduced size of the view in drawing especially when the object is very big.
LONG BREAK LINE
Used to show surfaces, edges or corners of an object that are hidden from view.
HIDDEN LINE