A gjenganger is a type of ghost from Scandinavian folklore. They can return from death for several reasons, usually some traumatic event that prevents the soul from resting.
Both murder victims and the murderers themselves are said to be unable to rest after death, and can rise as gjengangere. Likewise, those who commit suicide often come back as a restless spirit. The symbol of the cross painted on one's headstone and carrying the coffin three times around the churchyard before burial are methods to prevent the creation of a gjenganger.
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