What is the meaning of visual call sign?

(DoD, NATO) A call sign provided primarily for visual signaling. See also call sign.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). visual call sign. Retrieved September 20, 2026, from http://smartdefine.org/visual_call_sign/definitions/1964620
ChicagoMilitary Dictionary (DoD). 2011. "visual call sign" http://smartdefine.org/visual_call_sign/definitions/1964620 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, visual call sign, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/visual_call_sign/definitions/1964620>.
MLAMilitary Dictionary (DoD). "visual call sign" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/visual_call_sign/definitions/1964620>