A metamaterials handbook is a book that explains what metamaterials are. Metamaterials are materials that have special properties that are not naturally found in nature. For example, they can block or absorb certain types of light, create special sound effects, or even increase strength. They are made out of chemicals and other materials that are put together in special ways that give them these special properties. The metamaterials handbook explains how metamaterials work and how they can be used in different ways.