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Definition of Indefinite call sign
1. Noun. (military) 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. ¹
¹ Source: wiktionary.com
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1. Noun. (military) 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. ¹
¹ Source: wiktionary.com