Nicknamed `` Chuck '' , `` Sir Charles '' , and `` The Round Mound of Rebound '' , Barkley established himself as one of the National Basketball Association 's ( NBA 's ) most dominating power forwards .
Nicknamed `` Sir Charles '' for his aggressive and outspoken demeanor , and `` The Round Mound of Rebound , '' for his unusual build and talent as a player , Barkley established himself as one of the National Basketball Association 's most dominating power forwards .