What does OP stand for?

What does OP mean?

OP	Operation Point Miscellaneous » Unclassified
OP	Optimum Price Miscellaneous » Unclassified
OP	Off Premises Miscellaneous » Unclassified
OP	Overton Park Miscellaneous » Unclassified
OP	Oil Pan Miscellaneous » Unclassified
OP	Organic Percussion Miscellaneous » Unclassified
OP	Original Post Miscellaneous » Unclassified
OP	One Power Miscellaneous » Unclassified
OP	One Piece Miscellaneous » Unclassified
OP	Off Priveleges Miscellaneous » Unclassified
OP	Oral Presentation Miscellaneous » Unclassified
OP	Ordinary Prat Miscellaneous » Unclassified
OP	Originally Posted Miscellaneous » Unclassified
OP	Official Publication Governmental » US Government
OP	Optional Procedure Mailing System Miscellaneous » USPS
OP	Overland Park, Kansas Regional » States