I love the look of blank "meatballs" on the sides of mid-century sports race cars...So much so, that I added them to my street car, a Miata (MX-5/Eunos for the rest of the world).

Yeah, I've probably been watching too much "Victory by Design"...
Anyhoo, now I'm getting questions as to the origin of blank meatballs. Could anybody please inform me the reason why there are blank "meatballs"? Did this originate "back in the day" (I could swear I've seen pictures), or is this a more recent graphic trend that's kind of a generic reference to a racing pedigree? And are "meatballs" also called "roundels" or is that something else?
Thanx much in advance,
DREW