Saknussen was the presumed name of a non-Ferengi humanoid whose remains were discovered by Rauplop of Rangahorn and Professor Dverl far beneath the surface of Ferenginar. The name was found on a tag on the corpse's underwear, and his origins remain a mystery. (DS9 reference: Legends of the Ferengi)

This is apparently an in-joke reference to a background character from Jules Verne's A Journey to the Center of the Earth.