A doppelgänger (ˈdɒpəlɡɛŋəɹ,_-gæŋəɹ), sometimes spelled as doppelgaenger or doppelganger is a biologically unrelated look-alike, or a double, of a living person.
In fiction and mythology, a doppelgänger is often portrayed as a ghostly or paranormal phenomenon and usually seen as a harbinger of bad luck. Other traditions and stories equate a doppelgänger with an evil twin. In modern times, the term twin stranger is occasionally used.
The word doppelganger is a loanword from the German noun Doppelgänger, literally meaning double-walker. The singular and plural forms are the same in German, but English writers usually prefer the plural "doppelgangers". In German, there is also a female form, "Doppelgängerin" (plural: "Doppelgängerinnen"). The first known use, in the slightly different form Doppeltgänger, occurs in the novel Siebenkäs (1796) by Jean Paul, in which he explains his newly coined word in a footnote; the word Doppelgänger also appears in the novel, but wit