I have been using the phrase – Charger/Dish - The Charger-Dish term is likely enough just my own personal expression - explaining to myself that something over 16 1/2" is a charger - but I know some are dishes not plates – they served different foods on big dishes to big plates – well they must have done!!!!!!!!. (otherwise the diner would have gravy/sauce/hot and wet - in his lap!)
I thought to myself that it is sort of - the gravy test - will it (the gravy) stay there easily!