> I've also heard the terms "quadrat" and "tetrat" to describe a sequence of four books. I can't say I like those terms, but I think they're a bit better than "tetrology".
>
> And I remember a sequence of Dr Who novels that were refered to as a "decalog". I don't remember if there were 10 books, but I think there were.
>
> Overall, I think I prefer "cycle".
>
> winter"and how many different enumeration schemes are there, anyway?"mute

I have seen series of books with "quintet" (five) and "sextet" (six). And, of course, there was the HHGTTG "trilogy". SLATFATF was once billed as "Book four in the inaccurately named HHGTTG triolgy" and Mostly Harmless was "Book five in the increasingly inaccurately named HHGTTG trilogy".

Don Monkey