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TeachMeFinance.com - explain unknown unknown 'unknown' is an military term. It means '(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 by air defense or naval engagement systems'. Previous 5 Terms: unit type code unitized load_ unity of effort _ universal polar stereographic grid- universal transverse mercator grid - Next 5 Terms: unknown unknown_ unmanned aircraft _ unmanned aircraft system- unplanned target - Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.