Twin
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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic, meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic, meaning that each
Identical twins can be difficult to visually distinguish especially when young, as demonstrated by brothers Billy and Bobby Mauch.
Adult fraternal twins
Fraternal twin brothers as young babies
Austrian TV host Mirjam Weichselbraun (right) and her fraternal twin Melanie look very similar but with a significant difference in height.
Doppelgänger
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A doppelgänger is a supernatural double of a living person, especially one who haunts the doubled person. In fiction and mythology and in common parlance, the doppelgänger either is a ghost or a paran
Twin
…in humans) is a singleton; one of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgänger. The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. The…
Dante Gabriel Rossetti, How They Met Themselves, watercolour, 1864
Percy Shelley, per Mary Shelley, had claimed to have met his own doppelgänger.
William Wilson and his doppelgänger, in Edgar Allan Poe's story (illustration by Arthur Rackham)
A scene in The Student of Prague, where the student Balduin faces his double