What are nominal numbers primarily used for?

Nominal numbers are primarily used for naming things rather than indicating quantity or order. They serve to identify or categorize items, such as identifying a jersey number in sports or labeling a product. This type of number does not convey information about size, value, or sequence but rather functions as a label or identifier. For instance, a football player’s jersey number, like 10, does not imply that there are ten players; it simply identifies that particular player.

The other options involve functions that require numerical values to imply quantity, order, or measure, which is not the purpose of nominal numbers. While nominal numbers can be associated with quantities in certain contexts, their primary function is to denote identity rather than quantity or scale.