In ceramics, "D" is for defltware–the world-famous blue and white earthenware pottery. Although Deflt is a town in Holland, delftware describes all 'tin-glazed earthenwares' made in the Netherlands and the British Isles.
I'm working on a set of stair raisers (the vertical element in a set of stairs, forming the space between one step and the next) for a customer in Florida. It involves using the glazes as watercolors and a Spanish galleon.