What is the meaning of mode (identification, friend or foe)?

mode > identification, friend or foe
(DoD) The number or letter referring to the specific pulse spacing of the signals transmitted by an interrogator or transponder.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). mode (identification, friend or foe). Retrieved September 29, 2026, from http://smartdefine.org/mode_(identification%2C_friend_or_foe)/definitions/1962873
ChicagoMilitary Dictionary (DoD). 2011. "mode (identification, friend or foe)" http://smartdefine.org/mode_(identification%2C_friend_or_foe)/definitions/1962873 (accessed September 29, 2026).
HarvardMilitary Dictionary (DoD) 2011, mode (identification, friend or foe), Smart Define, viewed 29 September, 2026, <http://smartdefine.org/mode_(identification%2C_friend_or_foe)/definitions/1962873>.
MLAMilitary Dictionary (DoD). "mode (identification, friend or foe)" 4 April 2011. Web. 29 September 2026. <http://smartdefine.org/mode_(identification%2C_friend_or_foe)/definitions/1962873>