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The term 'uniped' refers to a person or creature with only one foot and one leg, as contrasted with a biped (two legs) and a quadruped (four legs). Moving using only one leg is know as 'unipedal' movement.
In the Saga of Eric the Red, a native of Vinland who is described as being one-legged kills one of Eric's men. In the children's fiction book ''They Came on Viking Ships'' by Jackie French, a uniped is a one-legged Norse mythical creature that lived in the south of Vinland during the time of the expedition of Freydís Eiríksdóttir.