Doppelgänger, or "Fetch", is the ghostly double of a living person, a sinister form of bilocation. In the vernacular, "Doppelgänger" has come to refer (as in German) to any double or look-alike of a person. The word is also used to describe the sensation of having glimpsed oneself in peripheral vision, in a position where there is no chance that it could have been a reflection. They are generally regarded as harbingers of bad luck. In some traditions, a doppelgänger seen by a person's friends or relatives portends illness or danger, while seeing one's own doppelgänger is an omen of death, or results in immediate death upon the two coming face to face. In Norse mythology, a vardøger is a ghostly double who precedes a living person and is seen performing their actions in advance. The word "doppelgänger" is a German loanword. It derives from Doppel (double) and Gänger (goer), although the German part word -gänger only occurs in compound nouns. As is true for all other common nouns in German, the word is written with an initial capital letter. The etymology of the word is usually traced to the 1796 novel Siebenkäs, by Jean Paul, in which the term is qualified by a footnote.

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