TeachMeFinance.com - explain indefinite call sign
indefinite call sign 'indefinite call sign' is an military term. It means '(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'.
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Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English".