This is an ancient Roman amulet for luck. Yes those are flying penises.
Also of note, the Roman god of marriage, Mutunus Tutunus, whose name is derived from two Latin slang words for penis. His name is essentially Dick Wiener. If you have ever wondered just how much like us the Romans were, read the etymology section.
It’s a flying fuck.
It used to be given, and now look, it’s no more.