Norse for Nailship.
In mythology, it is a boat made entirely from the untrimmed fingernails and the toenails of the dead. Nordic eddas have it that Loki and Hrym will pilot this ship full of the souls of Hel to Asgard to destroy the God. This will be part of Ragnarök.
But, the process can be slowed. If you trim the nails of the dead, then evil has less material to build from and the ship’s construction will be slowed.
Thanks to Jay and Miles X-Plain the X-Men for first pointing out this story to me.