Pennyweight is derived from the price for a hundred nails in 15th century England: the larger the nail, the higher the cost per hundred. The pennyweight also bears no relation to the weight of the American "penny" (1 cent) coin, which weighs 2.5 g (for those minted after 1982). Pennyweight A pennyweight (abbreviated dwt, from denarius weight) is a unit of mass that is equal to 24 grains, of a troy ounce, of a troy pound, approximately 0.054857 avoirdupois ounce and exactly 1.55517384 grams. In the Middle Ages, a British penny's weight was literally, as well as monetarily, of an ounce
Five Grains as in the Min Nan custom of creating a Taoist stove to cook "Chui Zhao Fan", a meal for the Kitchen God in which five dry seeds are placed into a slot in the chimney of the stove. Casual worshippers may simply use any five beans (e.g., of different colors) instead of any particular set of grains. Chinese cuisine is not known for any single recipe using all five grains, so there is no grain equivalent of five-spice powder or "eight treasure rice" (八寶飯, "babaofan"). Many, perhaps most, Chinese cooking employs the grains in some fashion, though: rice, congee, noodles,