+Hexagonal Close Packed (HCP) describes a highly efficient way to arrange spheres, where each sphere touches 12 others. This common [Crystal Structure](/wiki/crystal_structure) maximizes [Packing Density](/wiki/packing_density) within a regular lattice, forming distinct layers.
+## See also
+- [Unit Cell](/wiki/unit_cell)
+- [Close Packing](/wiki/close_packing)
+- [Lattice](/wiki/lattice)
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