identification, friend or foe
Also found in: Dictionary, Acronyms, Wikipedia.
identification, friend or foe[ī‚dent·ə·fə′kā·shən ′frend ər ′fō]
A system using pulsed radio transmissions to which equipment carried by friendly forces automatically responds, by emitting a pulse code, thereby identifying themselves from enemy forces; a method of determining the friendly or unfriendly character of aircraft, ships, and army units by other aircraft, ships, or ground force units. Abbreviated IFF.