Snapping

Mode	Info
Free Snap	Allows for the crosshair to move freely while other snap modes are enabled. Commands: os, sf
Snap Grid	Snap to a grid intersection. Command: sg
Snap Endpoints	Snap to the endpoints of a line segment, the quadrants of a circle, a point, or the alignment point of a text or mtext object. Command: se
Snap on Entity	Snap to the path of an entity. Commands: np, sn
Snap Center	Snap to the center of a circle or ellipse. It will also snap to the foci of an ellipse. Command: sc
Snap Middle	Snap to the middle of a path. Enabling this mode displays a "Middle points" input. If you change the value to 2 then you can snap to the trisection points of a line segment. Command: sm
Snap Distance	If you snap to the endpoint of a line segment then activate 'snap distance' and input 50, then it will snap to a point 50 units from the endpoint on the line segment. However, it will also snap to a point that is 50 units from the other endpoint. Command: sd
Snap Intersection	Snap to the intersection of two entities. This does not currently work for polylines. Command: si
Exclusive Snap Mode	On: only one snap mode is allowed Off: multiple snap modes are allowed The snap modes are remembered in each state.