What does secondary identifiers means in sets?

I am new in terraform and asking the question here

I was reading the documentation and i got struck at one point

Set is a collection of unique values that do not have any secondary identifiers or ordering.

what does secondary identifiers means in terraform?

The term “secondary” is probably not good there, but it’s not meant to mean anything specific to Terraform. Values in a set are only identified by their value, there is no key or ordinal value to index them like in a map or a list.

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Thank you @jbardin , now i understood.

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