出典:Wiktionary
identification friend or foe (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/15 05:12 UTC 版)
In telecommunications, identification, friend or foe (IFF) is an identification system designed for command and control. It is a system that enables military and national (civilian-located ATC) interrogation systems to identify aircraft, vehicles, or forces as friendly and to determine their bearing and range from the interrogator.