A bolt is a piece of cloth woven on a loom or created by a knitting machine, as it is processed, stored and/or marketed. Consequently, its dimensions are highly variable — flexible and dependent upon the manufacturing, machinery, quantity, size, thickness and quality of the product. It is a unit used in manufacturing, transport and inventory. It is also used as a descriptor for wallpaper, which uses different fabrication machinery. Being encompassing, it is by its nature a generic and ambiguous term of convenience and context, used to describe fabric and wallpaper.