What is the difference between a symbol and a special symbol?

In the Check for Palindrome challenge, the instructions state to “remove all non-alphanumeric characters (punctuation, spaces and symbols)” but also state to “pass strings with special symbols”. What is the difference between symbols and special symbols?

From the instructions I gather I should remove spaces, underscores, number signs, and dashes, and I should keep periods. Is there a standard list for these things?

Remove everything that isn’t a letter or a number. I’m guessing that the “special symbols” is just an editing mistake.

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