I am probably the only person in the universe who calls this "sauce". To me gravy is what you put on your potatoes.
From where I come from it's called Gravy when you put Meatballs, Sausage, Bracciole, and/or any other kinds of solid meats in it. Hence "Meats in the
GRAVY. I've never heard it called meats in the sauce.
We call it sauce when it's a Marinara Sauce, a Bolognese Sauce ( chopped meat based ), Alfredo Sauce, Vodka Sauce, etc.
But when you have 'solid' meats like the ones I mentioned above, it becomes Meats in the Gravy.
TIS, you're an Italian, what did your family call it when they added and cooked meatballs and sausages in it?