On a conference call with reporters Friday, leaders of both the NBA and the National Basketball Players Association said the league and union were discussing several methods of using the NBA’s platform in Orlando to call attention to racial equality, social justice and police brutality. Over the weekend, Chris Paul, president of the players’ union, told ESPN that the league and union were collaborating to allow players to wear uniforms with personalized messages linked to social justice on the backs of their jerseys in place of players’ last names.