略語大辞典 [Traf] 27 NDB non-directional radio beacon 無指向性ビーコン. ホーミング ビーコン. ビーコンは航空機用の無線標識電波.non-directional radio beacon; a radio frequency signal for aircrafts; ref. VOR(VHF omnidirectional radio range),RMI(radio magnetic indicator), HSI(horizontal situation indicator); [Traf:E:C]. 丸善「略語大辞典」JLogosID : 11862618