Either glue retainer pin into button face or use screw with pan head.

The asterisk (/ˈæst(ə)rɪsk/ *), from Late Latin asteriscus, from Ancient Greek ἀστερίσκος, asteriskos, "little star", is a typographical symbol. It is used as “wild card” in computer programming. An asterisk is the symbol *. It is used to signify omission or doubt in text or to indicate a footnote with additional information about a certain piece of text. It is also used as a symbol (*) used to mark printed or written text, typically as a reference to an annotation or to stand for omitted matter.

A symbol used almost only for replacing the vowels in a curse word by those who are too scared to type the real word.