What is the expanding shell of hot gas created by the dispersal of supernova material called?

Answer

Supernova remnant

The supernova event concludes by sending its newly manufactured wares into space, often creating an expanding shell of hot gas called a supernova remnant.

What is the expanding shell of hot gas created by the dispersal of supernova material called?
Elementastronomystarsupernovanucleosynthesis