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Archaeopronouns are third person pronouns and forms or pronouns that were used in the past and are no longer in usage. However, some non-binary people may reclaim them and use these pronouns to express their gender in language.
One example can be Classical Chinese pronoun "其", used by some Chinese non-binary people.
List of archaeopronouns in various languages
Chinese
伊 - used historically in 1870-1930 as an exclusively feminine pronoun.
渠
彼
其 - pronoun used in Classical Chinese