It's an asterisk. Since you see the asterisk at the top, that indicates that those marked with an asterisk allow polygamy to be legal, but only for Muslims
Wikipedia: "Polygamy is legal under certain circumstances in South Africa. . . . Jacob Zuma, the former president of South Africa, is a self-proclaimed polygamist. He has been married five times, and is currently married to four different women."
Well, actually they don't consider South Africa because it's just recognized under an costumary law. But, looking more closely it seems that is allowed. Thanks for sharing your thoughts.