From Joy of Baking.com: "Heavy cream or heavy "whipping" cream, has 36 - 40% butterfat and when whipped it holds its form and doubles in volume. Heavy cream is used for filling and decorating pastries. Whipping cream has a butterfat content of 30%. It whips but not as well as heavy cream, and will not hold its form long. Good for fillings but does not hold up well for piping. Light or Coffee cream has 18-30% butterfat. Half and Half cream is a mixture of cream and whole milk and contains 10 ½ - 12% butterfat. Mainly used in beverages and does not whip. Single cream has a 20% butterfat content and is used in both sweet and savory cooking. Double (rich) cream has a 48% butterfat content and can be whipped and is also used in pies and sauces. Clotted cream (Devonshire or Devon Cream) is a thick, rich, yellowish cream with a scalded or cooked flavor that is made by heating unpasteurized milk until a thick layer of cream sits on top. The milk is cooled and the layer of cream is skimmed off. Clotted cream has 55-60 percent fat content and is so thick it does not need whipping. Traditionally served with scones and fruit. Clotted cream is produced commercially in Devon, Cornwall, and Somerset England. Crème fraîche is pronounced 'krem fresh'. It is a thick and smooth heavy cream with a wonderfully rich and velvety texture. This matured cream has a nutty, slightly sour taste produced by culturing pasteurized cream with a special bacteria. In France, where it originated, the cream is unpasteurized so it naturally contains the bacteria necessary to make crème fraîche. The butterfat content varies (usually 30%), as there is no set standard so you will find every brand tastes a little differently."