If the Earth had another core, what would it be called?

Question: If the Earth had another core, what would it be called?
- Keywords:
  core,
  earth,
  space
Asked by nihou1234 to Rebecca, Iain, Hayley, Anna on 23 Jun 2015.
- Iain Bethune answered on 23 Jun 2015:
  
  This isn’t really possible, as gravity would cause the two cores to be pulled together and merge into one. That’s why the earth has a layered structure, like an onion.
  
  It is possible on cold, dead bodies like the moon that you can get uneven distributions of mass below the surface – called MASCONs (Mass Concentrations). Even though gravity would tend to pull them together, the moon’s interior is solid, so they can’t move.

Question: If the Earth had another core, what would it be called?