They don’t appear in the article. More than likely, it is the result of a font that is not enabled on your computer.
Aha! You, my friend, are one of the reasons why I don't post certain threads. The purpose of this forum is not to read a title which can be titillating but lacks substance. That is provided by the content which details actual facts. Several times I have come across comments which were obviously based on a title whereas the content was quite different and the poster's comments made no sense. Why bother to post comments based on a title? It's pointless.
In answer to your question, however, those symbols result when your computer does not recognize or interpret certain fonts. Failing a comparable equivalent, it places those symbols on your screen.