What does AO stand for?

What does AO mean?

AO	Auto Ordnance Miscellaneous » Unclassified
AO	Altogether Outdoors Community » Scouting
AO	Amateur Operator Academic & Science » Amateur Radio
AO	Aubrey Organics Business » Firms
AO	Aviation Ordnance Miscellaneous » Unclassified
AO	Access Orlando Medical » Hospitals
AO	Anime Online Internet
AO	American Overseas Governmental » US Government
AO	Academic Office Academic & Science » Universities
AO	Ancient One Miscellaneous » Names and Nicknames
AO	Aerial Observer Governmental » Military
AO	Air Observer Governmental » Transportation
AO	Aviation Officer Governmental » Transportation
AO	Aosta (Province) International » Italian
AO	Assessment Objective Business » General
AO	Air Officer Governmental » Military
AO	Advanced Optics Academic & Science » Physics
AO	Auxiliary Oiler Miscellaneous » Unclassified
AO	Associate Post Office Miscellaneous » USPS
AO	Antique and Old Business » Products
AO	Autonomous Object Computing » General
AO	Auxiliary Office Governmental » FBI Files
AO	Authorize Only Miscellaneous » Unclassified
AO	Army Orders Governmental » Military
AO	Aqueous Oxygen Academic & Science » Chemistry