An uncanny double of a person, or someone who looks remarkably similar to another person.
From German 'Doppelgänger,' combining 'doppel' (double) and 'gänger' (goer/walker). Emerged in German folklore and Romantic literature in the 1700s as a sinister supernatural concept.
In German folklore, seeing your doppelgänger was a sign of impending death, but the concept has become popular in modern sci-fi for exploring identity and alternate timelines—same word, completely different vibes.
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