Answer: This is an example of a NOMINAL SCALE.
Explanation: A nominal scale is a measurement size/scope used to categorize items based on their names and numbers are used as label or tag. Examples of nominal scale can be in the classification of religion, gender, city of residency, etc. A nominal scale measurement normally deals only with variables that numbers are of no consequence or where numbers have no value.
For example,
1- urban
2- suburban
3-rural,
In this case, numbers are simply used as tags to represent types of settlement. They have no value.