The hell controlled by Leviathan is often called Hell directly but other times is alluded to that it is more complicated than that. Leviathan’s Hell is specifically for those whose sins are related to desire. For example, this would put all the sexual predators in this specific hell.
Based off information from Hellraiser Dark Watch series there are other hells or parts of hell. Whether this is levels, circles or different locations entirely the point is made clear. In Dark Watch we are introduced to Hell for those whose sin is related to fury or anger.
From this we can extrapolate or make a reasonable guess that the author had eventual plans to create different hells based off the seven deadly sins:
Here’s what we can learn about Hell through not only Hellraiser’s material but also through the biblical teachings and holy tradition based down from the fathers of the church.
In what world do Cenobites appear as angels to people? I never understood this statement when
watching the movies. I basically assumed
it was some sort of very disturbed and bizarre fetish at the extreme end of
S&M (sadomasochism). In some cases, the
comics seem to confirm this.
The name angel means messenger so perhaps they are simply referring to themselves in this manner as a messenger even if they are a messenger for the devil.
“Pinhead” aka The Hell Priest is not the ruler over all of
hell. He is not even the ruler over the
portion of hell we see in the films, that is Leviathan. The Scarlet Gospels confirms when they talk
of Lucifer, the fallen angel. Much of
the story of that book involves venturing to Lucifer/Satan’s cathedral in an
attempted coup by the hell priest.
The nails (not pins) in his head are actually a sort of crown or visual representation of position of authority. Throughout the expanded universe we see other people portray pinhead besides World War I soldier Elliot Spencer. Other notable Pinhead's include Kirsty Cotton and Harry D'Amour.
There are few historical people that are included into the Order of the Gash. One is Jack The Ripper in the form of Saucy Jack. The other is Lon Chaney, who physically wears the faces of others to create masterful performances.