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call letters

noun
🔊/ˈkɔːl letəz/
🔊/ˈkɔːl letərz/
 [plural] (North American English)
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  1. the letters that are used to identify a radio or television station（电台、电视台的）代号字母，呼号
    • the call letters WNBC台号字母 WNBC
    Topics TV, radio and newsc2