Thor's hammer

noun2

1. •
   Mjöllnir (Mjollnir), the distinctively T-shaped war-hammer of the Norse thunder god Thor, or a representation thereof, now used as a symbol by various pagan religious groups.
2. •
   (slang) An orbital drop hypervelocity kinetic energy weapon (KEW). A theoretical weapon, originating from a U.S. government study, Project Thor, from the 1950s.