| Identification, Friend or Foe: a system of transmitters and transponders that uses coded signals to distinguish between friendly and hostile aircraft. |
| if and only if. |
| iff abbr. if and only if |
| IFF abbr. identification, friend or foe |
IFF
1.
2. Identify friend or foe (radar).
iff mathematics, logic
if and only if, i.e. necessary and sufficient. For example, two figures are congruent iff one can be placed over the other so that they coincide.
(2002-12-28)
| iff if and only if |
| IFF identification, friend or foe |
