What does the symbol ^ over A2 indicate?

The symbol ^ over A2 represents that the aircraft has entered another sector without a handoff. This notation typically indicates a situation where an aircraft has transitioned from one air traffic control sector's airspace to another without the required communication transfer between controllers. Such a scenario can lead to potential confusion regarding the aircraft's altitude, heading, and intentions, requiring the receiving controller to establish contact with the aircraft to ensure proper handling.

Understanding this symbol is crucial for maintaining effective communication and coordination between sectors, thereby ensuring the safety and efficiency of air traffic operations. In contrast, the other options refer to specific operational statuses or phases of flight that do not align with the meaning of this symbol.