ˈcall sign BrE AmE noun [countable usually singular] ( also call letters especially American English )
a name made up of letters and numbers, used by people operating communication radios to prove who they are
ˈcall sign BrE AmE noun [countable usually singular] ( also call letters especially American English )
a name made up of letters and numbers, used by people operating communication radios to prove who they are
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012