annunciator
noun
                                                                                                                            
                                                            an·nun·ci·a·tor
                    
                                                                                                              
                                                                                                                                  ə-ˈnən(t)-sē-ˌā-tər  
                                                      
                                                          
            
                                
              
          
                                                      : one that annunciates                                      
                
                                
            specifically                
          
                                                      : a usually electrically controlled signal board or indicator                                      
            
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  Merriam-Webster unabridged




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