I have a feeling that it's only called the death swing at that one school i went to. The school has a park right next to it and apparently someone cracked there head open or something while playing on it and thats why its called that (but i don't know if its true)
I was on it once though and then a group of people in my year came over and wanted to go on it and i sat on it with someone else and all the other people there were pushing and spinning it, it was really fun but also terrifying because i was hanging off the side of it because the other person on it had moved into the middle and i couldn't fit on anymore XP
Im very sure if i had have fallen off i would have died, or at least broken something, people got hurt on that swing a lot though i think but it still seemed to be everyone's favourite thing (including mine)