-OSNAP command
Toggles entity snap modes.
                Alias: -OS, ESNAP
Description
Toggles entity snap modes at the Command line (short for "object snap").
Note: Entity snaps help you draw and edit precisely by
                    snapping the cursor to the nearest geometric feature.
            Options within the command
- NEArest
 - Toggles nearest entity snap mode. Snaps to the nearest point on any entity.
 
- ENDpoint
 - Toggles endpoint entity snap mode. Snaps to the endpoints of open entities, such as lines, arcs, open polylines, and open splines.
 
- MIDpoint
 - Toggles midpoint entity snap mode. Snaps to the midpoint of open entities.
 
- CENter
 - Toggles center entity snap mode. Snaps to the center of circular entities, such as circles, arcs, and polyarcs.
 
- GeometriC cEnter
 - Toggles geometric center entity (GCenter) snap mode. Snaps to the centroid of any closed polylines and splines, planar 3d polylines, regions and planar faces of 3D solids.
 
- PERpendicular
 - Toggles perpendicular entity snap mode. Snaps to the perpendicular of one entity to another.
 
- TANgent
 - Toggles Tangent entity snap mode. Snaps to the tangencies of circular entities.
 
- QUAdrant
 - Toggles quadrant entity snap mode. Snaps to the quadrant points of circular entities, such as circles, arcs, and polyarcs.
 
- INSertion point
 - Toggles insertion entity snap mode. Snaps to the insertion point of blocks and text.
 
- POInt
 - Toggles node entity snap mode. Snaps to point entities.
 
- EXTension
 - Toggles extension entity snap mode. Snaps to the intersection of open entities, as if they were extended to the point of intersection.
 
- PARallel
 - Toggles parallel entity snap mode. Snaps to the parallel point of entities. Allows to draw lines, polyline segments, xlines and rays parallel to another entity.
 
- INTersection
 - Toggles intersection entity snap mode. Snaps to the intersection of any pair of entities.
 
- APParent intersection
 - Toggles Apparent entity snap mode. Snaps to the apparent intersection of entities in 3D space.
 
- NON
 - Clears entity snaps.
 
- ON
 - Turns all entity snap modes on.
 
- OFF
 - Turns all entity snap modes off.
 
Note: Modes can also be turned off with the NONE
                    command.