IFFabbr.当且仅当(=if and only if)IFF.abbr.敌我识别器(=Identification；Friend or Foe)Iffenecker伊费内克Ifflaender伊夫伦德IFF device“敌-我”识别器Iffennecker伊费内克ifflaiamine依弗莱胺iffraction grating衍射光栅IFF Reply Evaluator敌友识别应答鉴定器IFF signal decoding敌我识别信号译码IFF - International Fashion Fair日本横滨国际服装博览会IFFT Inverse Fast Fourier Transform反向快速傅立叶变换