pentalogy
The Percy Jackson series is a series of 5 books. Each individual book is a novel, but the 5 of them together is a series.
They call it a dilogy or duology.
tetralogy
A trilogy
There are currently 5 books in the series.
A trilogy.
5.
Rick Riordan has written several series, including Percy Jackson & the Olympians (5 books), The Heroes of Olympus (5 books), The Kane Chronicles (3 books), Magnus Chase and the Gods of Asgard (3 books), and The Trials of Apollo (5 books).
I think there's going to be around 5 books since the last series was 5.
There are 5 books in the series, and there is going to be a new series called Geth and the Return of the Lithens
about 5
5 i think