The albums, and, while being individuals albums can also be considered as a triple album.
Sleeves put together end to end form a single picture. Same for the titles (Third Degree Burnt... yes Third is the first one). And tracks have two numbers. One for the disc it is on, and one for the place it occupies on the triple album (for exemple: Track 9 of this disc is also Track 24 of the triptych... see images)
This was originally released with a reply card inside the digipak.
Track 0 is a pre-gap hidden track.