Dødheimsgard (sometimes shortened as DHG) was originally a Norwegian black metal band formed in 1994, but 1999's 666 International saw them shift towards a more experimental, avant-garde/industrial black metal style. They went through some line-up changes, replacing Aldrahn, Zweizz and Czral.
"Dødheimsgard" is a conjunction of three words: Død which means death, heim which means home and gard which means (at least in this context) mansion. A natural translation into English would be "Mansion of Death", alternatively Realm of the Dead/Death. Read more on Last.fm