Nominal (Think Name — Both words come from the same Latin root.) Names of things don't involve numbers.
Male ? Female
Single ? Married ? Registered ? Separated ? Divorced ? Surviving Spouse
Animal ? Vegetable ? Mineral ? Other
These are categories. You cannot order them; in other words, you cannot say that Female has higher value than Male, or vice versa. They are just names (think nominal).
Now, if you were unable to tell the difference between nominals and any of the other measuring scales (which all involve numbers), then I'd conclude that you never really read their definitions.
If you need references, try googling keywords: nominal ordinal interval ratio
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