In Percy Jackson and the Olympians what is picture or sympol on beads?

You're likely thinking of the beads worn by Annabeth Chase, a character in the Percy Jackson series. The beads on her bracelet are not pictured with any particular symbol or image.

The beads are simply different colors, and they each represent a specific memory or important moment in Annabeth's life. This makes them a powerful and personal symbol for her, even if they lack a specific visual representation.