Well as previously stated, in Italian we have:
Buon Appetito = French Version, it is used commonly and regardless the meal (lunch/dinner)
Uncommon:
Buon Pranzo = (Have a)Good Lunch
Buona Cena = (Have a )Good Dinner
To a "buon appetito" its usual for the other ppl at the table to reply "Grazie, altrettanto" =~ "Thanks, same to you"
In my case i normally have meals alone or on different timetables from my family. But we use it on "grand occasions", mostly Christmas/ First Year/ Easter Day, when you have "official meals" alike the Thanksgiving Day for Americans.
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I need a die with 2 sides.
That's known as a "coin".
Oh, thanks. Too much D&D.