a four-digit number that identifies the specific product type

A model number is an exactly representable value of a real type. Operations of a real type are defined in terms of operations on the model numbers of the type. The properties of the model numbers and of their operations are the minimal properties preserved by all implementations of the real type.

This is the number assigned to an item by the manufacturer for identifcation purposes.

The drive Model number is Seagate's unique identifying code for each drive. The model number reflects the drive's form factor, capacity and interface.

Refers to a series of numbers and letters stamped onto either the knob or face of the barrel, identifying the style, dimension, and other specifications used in producing a bat. Bats made prior to the mid-1940s do not have model numbers and are referred to as made in the pre-model number era.

An item number for a finished good. This number may encompass other parts, such as a user's manual.