pronoun
a pronoun is a word that is used in place of a noun to avoid repetition. 'None' is a pronoun that means not any or not one.
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There were none of the requested documents included in the file.
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I asked for extra pickles on my burger but there were none.
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I thought there would be snacks at the party but there were none to be found.
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In a room full of people, she felt like none of them truly understood her.