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The Bravais lattice concept is used to formally define a ''crystalline arrangement'' and its (finite) frontiers. A [[crystal]] is made up of one or more atoms, called the ''basis'' or ''motif'', at each lattice point. The ''basis'' may consist of [[atom]]s, [[molecule]]s, or [[polymer]] strings of [[Solid|solid matter]], and the lattice provides the locations of the basis.
Two Bravais lattices are often considered equivalent if they have isomorphic symmetry groups. In this sense, there are 5 possible Bravais lattices in 2-dimensional space and 14 possible Bravais lattices in 3-dimensional space. The 14 possible symmetry groups of Bravais lattices are 14 of the 230 [[space group]]s. In the context of the space group classification, the Bravais lattices are also called Bravais classes, Bravais arithmetic classes, or Bravais flocks.<ref>{{cite web |title=Bravais class |url=http://reference.iucr.org/dictionary/Bravais_class |website=Online Dictionary of Crystallography |publisher=IUCr |access-date=8 August 2019}}</ref>
==Unit cell==
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