(DoD, NATO) A call sign which does not represent a specific facility, command, authority, activity, or unit, but which may represent any one or any group of these. See also call sign.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
| APA | Military Dictionary (DoD). (2011). indefinite call sign. Retrieved September 20, 2026, from http://smartdefine.org/indefinite_call_sign/definitions/1962143 |
| Chicago | Military Dictionary (DoD). 2011. "indefinite call sign" http://smartdefine.org/indefinite_call_sign/definitions/1962143 (accessed September 20, 2026). |
| Harvard | Military Dictionary (DoD) 2011, indefinite call sign, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/indefinite_call_sign/definitions/1962143>. |
| MLA | Military Dictionary (DoD). "indefinite call sign" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/indefinite_call_sign/definitions/1962143> |