What is crown called in The Lightning Thief?

In Rick Riordan's *The Lightning Thief*, the term "crown" isn't used to refer to a specific object or person. It's possible you're thinking of something else related to the story.

Could you please provide more context or details about what you're looking for?

For example:

* Are you thinking of a specific character? Maybe you're thinking of a character with a crown-like symbol or a character who has power over a kingdom.

* Are you thinking of a specific item or place? Perhaps you're thinking of a place or object that plays an important role in the story and is connected to a crown.

With more information, I can help you identify what you're looking for in *The Lightning Thief*.