If an aircraft is labeled O-12, what does this indicate?

An aircraft labeled as O-12 indicates a track being handed off to the same center. This designation signifies that air traffic control is either transferring the responsibility of the aircraft to a different controller within the same facility or confirming that the current controller will continue to manage the aircraft's flight while maintaining its radar track. It reflects operational procedures that ensure seamless transitions in managing air traffic, particularly in busy airspace or during periods of high traffic demand.

When considering other options, an approach scenario would typically involve a different set of designators or indications pertaining to an aircraft's status near an airport, while a holding pattern would imply specific maneuvers being performed by the aircraft that are not indicated by an O-12. A handoff to another center would involve a different code or indication that signifies a change in jurisdiction between air traffic control facilities.