An arrangement of particles in three-dimensional space is often described as a "crystal lattice" when referring to solid materials. In a crystal lattice, particles such as atoms, ions, or molecules are arranged in a repeating pattern, which extends in three dimensions. This systematic arrangement gives rise to the overall crystalline structure, influencing the material's properties like symmetry, hardness, and conductivity. Different types of lattices exist, such as face-centered cubic or body-centered cubic, each with its unique geometric arrangement. In other contexts, like gas or liquid states, particle arrangements are less ordered and more random, reflecting the nature of the substance in a less structured formation.