Cars are a prime American symbol of personal freedom, and politicians propose limits on them at their peril.

"And high heels are the prime symbol of erotic femininity."

The prime symbol is not related to prime numbers.

The Guardian offends every day: note the prime symbol being used in this headline.

(The prime symbol is also used for the same purpose.)

This is the prime symbol of the realization of opposites.

And not every computer program automatically changes prime symbols to apostrophes, as (for example) Microsoft Word does.

On confusing prime symbol with quote mark, couldn't this be more about font design than anything else?

The lion is therefore one of the prime symbols of Buddhism itself.

Note that the prime symbol ' is used to indicate gamma correction.