An Ingot is a block of pure metal.  Ingots are usually rectangular in shape.  A metal is stored in the form of ingots awaiting further processing like rolling or forging. Molten metal is poured into moulds and cooled to acquire the desired shape.  Since they are rectangular, they can be stacked one on top of another.  Ingots can come in a range of sizes, ranging from a few kilos to a hundreds of kilos.

Ingots of precious metals, such as gold are also used as currency and media of exchange.