A manufacturer usually provides an identifier for each particular type of product they make, known as a model, model variant, or model number (often abbreviated as MN, M/N or model no.). For example, Dyson Ltd, a manufacturer of appliances (mainly vacuum cleaners), requires customers to identify their model in the support section of the website. Brand and model can be used together to identify products in the market. The model number is not necessarily the same as the manufacturer part number (MPN).