Hexagonal lattice	Wallpaper group p6m	Unit cell

The hexagonal lattice (sometimes called triangular lattice) is one of the five two-dimensional Bravais lattice types. The symmetry category of the lattice is wallpaper group p6m. The primitive translation vectors of the hexagonal lattice form an angle of 120° and are of equal lengths,

| a 1 | = | a 2 | = a . {\displaystyle |\mathbf {a} _{1}|=|\mathbf {a} _{2}|=a.}

The reciprocal lattice of the hexagonal lattice is a hexagonal lattice in reciprocal space with orientation changed by 90° and primitive lattice vectors of length

g = 4 π a 3 . {\displaystyle g={\frac {4\pi }{a{\sqrt {3}}}}.}