Final answer:
An isotropic material is one that has uniform properties in all directions, and metals are a common example of isotropic crystalline solids.
Step-by-step explanation:
A material which has uniform properties in all crystallographic directions or orientations is referred to as isotropic. An isotropic material has a consistent and even distribution of matter that is the same everywhere. This is in contrast to anisotropic materials, which have varying properties depending on the direction of measurement. Metals are an example of isotropic materials; a pure metal is a crystalline solid where metal atoms are packed closely together in a repeating pattern, giving it uniform properties throughout.