Naglfar

Naglfar (Old Norse 'ship of the dead', see NA and FAR) is the ship of the dead, the biggest of all ships, which puts to sea at Ragnarǫk. It is helmed by the giant Hymir (or by Loki according to Vǫluspá), and it takes the sons of Múspell to their fight with the gods.

It is built from the uncut nails of the dead which is the reason why the nails of corpses should always be cut so that the arrival of Naglfar and the end of the world may be delayed.

The interpretation of Naglfar as 'nail ship' from Old Norse nagli = 'nail' is surely a folk-etymology.