What does the acronym "IFF" stand for?

The acronym "IFF" stands for "Identification Friend or Foe." This system is used primarily in military aviation and naval operations to identify aircraft or forces as friendly or hostile in order to prevent friendly fire incidents. IFF transponders receive interrogations from radar systems and respond with coded signals that confirm their identity. This technology relies on a combination of radar systems, coded responses, and secure communications to enhance situational awareness on the battlefield.

The other options do not accurately represent the concept of IFF. While terms like "Indication Frequency Foil," "Internal Flight Function," and "Interference Frequency Filter" may sound plausible within technical discussions, they do not relate to the established military standard of identifying entities as friend or foe. Understanding the correct usage and implications of IFF is crucial for anyone involved in operational planning and engagement in military scenarios.