A single slice of a citrus fruit like lemon or orange.

Citrus Fruit 

A closed book with a curved spine laying flat, seen from the side at an angle.

Closed Book Laying Flat

Two stacked books seen at an angle, the one at the bottom with a bookmark and the one on top with a round shape on its spine.

A thick closed book with a curved spine laying flat, seen from the side at an angle.

Four different-sized stacked books with curved spines.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.