What does N.D. stand for?

What does N.D. mean?

ND	Northern District Business » General
ND	Not Defined Academic & Science » Mathematics
ND	No Date Miscellaneous » Coins
ND	Neutral Density filter Academic & Science » Electronics
ND	Non Detectable Governmental » Military
ND	Naturopathic Doctor Business » Positions
ND	Network Drive Computing » Networking
ND	Non Destructive Miscellaneous » Unclassified
ND	Non-Directional Academic & Science » Amateur Radio
ND	Not Detectable Medical » Laboratory
ND	N-Dimensional Academic & Science » Mathematics
ND	No Drinking Community » Law
ND	No Depth Academic & Science » Ocean Science
ND	No Depression Academic & Science » Meteorology
ND	Neutron Detector Academic & Science » Physics
ND	Non Deterministic Miscellaneous » Unclassified
ND	Naval District Governmental » FBI Files
ND	Non-Degenerate Academic & Science » Mathematics
ND	Network Director Governmental » NASA
ND	New Donor Academic & Science » Chemistry
ND	Not Dated Miscellaneous » Unclassified
ND	Network Device Computing » Hardware
ND	None Detected Academic & Science » Physics
ND	Nadh Dehydrogenase Miscellaneous » Unclassified
ND	New Disc Miscellaneous » Unclassified