Yes, "denarius" is the denomination. The meaning of "Aemilia 8" is a bit more complex, but basically it's a catalogue reference.
Unlike Roman Imperial coins, Roman coins from the Republican period can't be sorted by Emperor. They do, however, often bear the name or otherwise give reference to the magistrate in charge of the mint in the year they were struck. So Republican coins have traditionally been sorted according to the family (gens) of the magistrate responsible for their issue. If you look at the
Wildwinds homepage, you'll see that Republican Roman coins are sorted by gens there, too. In 58 BC, the mintmaster was Marcus Aemilianus Scaurus, of the Aemilia gens.
The series of books by Sear titles "Roman Silver Coins" is one of the primary references for the Republican silver series. This particular coin is the eighth type struck by a member of the Aemilia gens, hence it's listed there as "RSC Aemilia 8". RSC Aemilia 8 is a very common Roman Republic type; the
wildwinds page is illustrated with 51 examples!
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis