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Extension
Causes a temporary extension line or arc to be displayed when you pass the
cursor over the endpoint of objects, so you can specify points on the
extension.
Insertion
Snaps to the insertion point of an attribute, a block, a shape, or text.
Perpendicular
Snaps to a point perpendicular to an arc, circle, ellipse, elliptical arc, line,
multiline, polyline, ray, region, solid, spline, or xline. Deferred Perpendicular
snap mode is automatically turned on when the object you are drawing
requires that you complete more than one perpendicular snap. You can use
a line, arc, circle, polyline, ray, xline, multiline, or 3D solid edge as an object
from which to draw a perpendicular line. You can use Deferred Perpendicular
to draw perpendicular lines between such objects. When the aperture box
passes over a Deferred Perpendicular snap point, an AutoSnap tooltip and
marker are displayed.
selection point
snap point
Tangent
Snaps to the tangent of an arc, circle, ellipse, elliptical arc, or spline. Deferred
Tangent snap mode is automatically turned on when the object you are
drawing requires that you complete more than one tangent snap. For
example, you can use Deferred Tangent to draw a line that is tangent to
two arcs, polyline arcs, or circles. When the aperture box passes over a
Deferred Tangent snap point, a marker and an AutoSnap tooltip are
displayed.
selection point snap point
Drafting Settings Dialog Box | 397