What brevity term describes a GROUP/ARM/CONTACT with no available sensor data?

The brevity term that describes a GROUP, ARM, or CONTACT with no available sensor data is "GHOST." This term is used to indicate that while a contact was detected or identified previously, there is currently no sensor data supporting its status. The use of “GHOST” effectively communicates to all parties in the operation that the situation is unclear and that further confirmation is needed. It implies the possibility that the target may have moved, gone off the radar, or is not currently being tracked by friendly sensors.

The other terms do not convey the same meaning relevant to sensor data absence. "DISAPPEARED" might suggest that a contact was seen and then completely lost, but it does not necessarily imply the lack of sensor data like "GHOST" does. "VANISHED" implies a sudden disappearance but lacks the technical nuance related to sensor statuses that "GHOST" provides. "UNKNOWN" is a broader term that could refer to an unidentified target but doesn't specifically indicate the established but unconfirmed status of a GHOST, which is critical in fast-paced combat environments for situational awareness and decision-making.