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Hapticity is the coordination of a ligand to a metal center via an uninterrupted and contiguous series of atoms. The hapticity of a ligand is described with the Greek letter ? . For example, ?2 describes a ligand that coordinates through 2 contiguous atoms. In general the ?-notation only applies when multiple atoms are coordinated . In addition, if the ligand coordinates through multiple atoms that are not contiguous then this is considered denticity , and the ?-notation is used once again. When naming complexes care should be taken not to confuse ? with ? , which relates to bridging ligands.