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 October 1, 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 October 1, 2026).
HarvardMilitary Dictionary (DoD) 2011, mode (identification, friend or foe), Smart Define, viewed 1 October, 2026, <http://smartdefine.org/mode_(identification%2C_friend_or_foe)/definitions/1962873>.
MLAMilitary Dictionary (DoD). "mode (identification, friend or foe)" 4 April 2011. Web. 1 October 2026. <http://smartdefine.org/mode_(identification%2C_friend_or_foe)/definitions/1962873>