Coal is a combustible black or brownish-black sedimentary rock composed mostly of carbon and hydrocarbons. The term 'coal' can refer to a variety of different things, including HOD, which stands for Head of Department, FUEL, which is a substance used to produce heat or power, BINS, which are containers used to store items, EMBER, which is a glowing, hot coal, SAAR, which is a region in Germany, CANNEL, which is a type of coal with a waxy texture, JET, which is a type of coal that is black and shiny, LIGNITE, which is a type of coal that is brownish-black and crumbly, TRAM, which is a vehicle used to transport coal, BIN, which is a container used to store coal, SEAM, which is a layer of coal, and COLORADOALABAMA, which is a coal-producing region in the United States.