The term for hell in the New Testament is Gehenna, which comes from the Hebrew “ge’henom” meaning “valley of Hinnom” which was a place outside Jerusalem associated with pagan child sacrifice in fire. The area was said to be cursed because of that and was used later as a place where the city’s waste was burned. In the NT it’s associated with hell, which seems to also be a convolution with the OT “sheol” (which was more like an underworld where all the dead go and not specifically a place of punishment).