Autodesk AUTOCAD 2006 Command Reference Manual page 834

Current osnap modes: current
Enter list of Object Snap Modes: Enter names of object snap modes separated with
commas, or enter none or off
Object Snap Modes
Specify one or more object snap modes by entering the first three characters
of the name. If you enter more than one name, separate the names with
commas.
ENDpoint
MIDpoint
INTersection
EXTension
APParent Intersection
For a description of each of these object snap modes, see the Object Snaps tab
of the Drafting Settings Dialog Box.
The -OSNAP command also presents the following additional options:
QUIck
Snaps to the first snap point found. Quick must be used in conjunction
with other object snap modes.
NONe
Turns off object snap modes.
NOTE The index for the Command Reference is at the end of Volume II.
810 | Chapter 16
CENter
NODe
QUAdrant
INSertion
PERpendicular
TANgent
NEArest
PARallel