* Simple: The "Lord of the Rings" is a famous trilogy of fantasy novels.
* With context: The author is planning a trilogy about the lives of three generations of a family.
* With specific description: The "Hunger Games" trilogy captivated readers with its thrilling dystopian world and strong female protagonist.
* Figurative: Her life was a trilogy of love, loss, and redemption.
The specific way you use "trilogy" will depend on the context of your sentence and what you want to emphasize.