What does UNKNOWN stand for?

What does UNKNOWN mean? We have 3 definitions. Read most used UNKNOWN meanings below.

UNKNOWN — (DOD) 2.An unidentified target. An aircraft or ship that has not been determined to be hostile, friendly, or neutral using identification friend or foe and other techniques, but that must be tracked b
UNKNOWN — (DOD) 3.An identity applied to an evaluated track that has not been identified.See also assumed friend; friend; hostile; neutral; suspect.
UNKNOWN — (DOD) 1.A code meaning "information not available."

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