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., and sometimes as M- or Mk).
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)
Because of the huge amount of similar products in the automotive industry, there is a special kind of defining a car with options (marks, attributes) that represent the characteristics features of the vehicle.
A model of a car is defined by some basic options like body, engine, gearbox, and axles.
The variants of a model (often called the trim levels) are built by some additional options like color, seats, wheels, mirrors, other trims, entertainment and assistant systems, etc.
Options, that exclude each other (pairwise) build an option family.
That means that you can choose only one option for each family and you have to choose exactly one option.
In addition, a specific unit of a product is often (and in some contexts must be) identified by a serial number, which is necessary to distinguish products with the same product definition.
In the case of automotive products, it is called the vehicle identification number (VIN), an internationally standardised format
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