Most of the object snaps that are described here affect only objects visible on the screen, including objects on locked layers, floating viewport boundaries, and polyline segments. You cannot snap to objects that are not visible, such as objects not displayed, objects on turned-off or frozen layers, or the blank portions of dashed lines.
Endpoint
Intersection
Midpoint
Perpendicular
Center
Tangent
Quadrant
Insert
Node
Nearest
None