ostracon
noun
                                                                                                                            
                                                            os·tra·con
                    
                                                                                                              
                                                                                                                                  ˈä-strə-ˌkän  
                                                      
                                                          
            
            
               plural ostraca
                                        ˈä-strə-kə  
    
            
        
    
                                
              
          
                                                      : a fragment (as of pottery) containing an inscription                                      
                
                  —usually used in plural
    
                
                    
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  Merriam-Webster unabridged




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