any unit used in linear measurement, as the inch, foot, meter, etc. Origin of linear measure. 1885-1890. First recorded in 1885-90.
Realistically, you could put any icing you wanted on a carrot cake. The wonderful beauty of cooking is that you can make it to your liking. But, the traditional icing that most people put on carrot cake is cream cheese icing.
Standard vegetable shortening is not ideal for the best results. If you are covering a cake with buttercream make enough to do the entire job because it is difficult to recreate colors: 9 x 13 cake needs about four cups icing. 12 x 18 cake needs about six cups icing. 9-inch round layer cake needs five cups icing. British Desserts. 5 Minutes to an Easy Chocolate Buttercream Icing.