Rhombohedral (or trigonal) lattice has one lattice point at the each corner of the unit cell. It has unit cell vectors a=b=c and interaxial angles α=β=γ≠90°.
Bravais lattice is a set of points constructed by translating a single point in discrete steps by a set of basis vectors. The French crystallographer Auguste Bravais (18111863) established that in threedimensional space only fourteen different lattices may be constructed. All crystalline materials recognised till now fit in one of these arrangements. The fourteen threedimensional lattices, classified by crystal system, are shown to the bottom.
Crystal system

Bravais lattices


cubic a=b=c α=β=γ=90° 


simple cubic

bodycentered cubic

facecentered cubic


tetragonal a=b≠c α=β=γ=90° 


simple tetragonal

bodycentered tetragonal


orthorhombic a≠b≠c α=β=γ=90° 


simple orthorhombic

basecentered orthorhombic

bodycentered orthorhombic

facecentered orthorhombic

monoclinic a≠b≠c α=γ=90°≠β 


simple monoclinic

basecentered monoclinic


hexagonal a=b≠c α=β=90° γ=120° 


hexagonal


rhombohedral a=b=c α=β=γ≠90° 


rhombohedral


triclinic a≠b≠c α≠β≠γ≠90° 

triclinic

Basecentered or sidecentered or endcentered monoclinic lattice (monoclinicC), like all lattices, has lattice points at the eight corners of the unit cell plus additional points at the centers of two parallel sides of the unit cell. It has unit cell vectors a≠b≠c, and interaxial angles α=γ=90°≠β.
Basecentered or sidecentered or endcentered monoclinic lattice (orthorhombicC), like all lattices, has lattice points at the eight corners of the unit cell plus additional points at the centers of two parallel sides of the unit cell. It has unit cell vectors a≠b≠c and interaxial angles α=β=γ=90°.
Bodycentered cubic lattice (bcc or cubicI), like all lattices, has lattice points at the eight corners of the unit cell plus an additional points at the center of the cell. It has unit cell vectors a = b = c and interaxial angles α=β=γ=90°.
The simplest crystal structures are those in which there is only a single atom at each lattice point. In the bcc structures the spheres fill 68 % of the volume. The number of atoms in a unit cell is two (8 × 1/8 + 1 = 2). There are 23 metals that have the bcc lattice.
Bodycentered orthorhombic lattice (orthorhombicI), like all lattices, has lattice points at the eight corners of the unit cell plus an additional points at the center of the cell. It has unit cell vectors a≠b≠c and interaxial angles α=β=γ=90°.
Bodycentered tetragonal lattice (tetragonalI), like all lattices, has lattice points at the eight corners of the unit cell plus an additional points at the center of the cell. It has unit cell vectors a=b≠c and interaxial angles α=β=γ=90°.
Crystal lattice is a threedimensional array of points that embodies the pattern of repetition in a crystalline solid. Don’t mix up atoms with lattice points: lattice points are infinitesimal points in space  atoms are physical objects.
Lattice constants are parameters specifying the dimensions of a unit cell in a crystal lattice, specifically the lengths of the cell edges and the angles between them.
Facecentered cubic lattice (fcc or cubicF), like all lattices, has lattice points at the eight corners of the unit cell plus additional points at the centers of each face of the unit cell. It has unit cell vectors a =b =c and interaxial angles α=β=γ=90°.
The simplest crystal structures are those in which there is only a single atom at each lattice point. In the fcc structures the spheres fill 74 % of the volume. The number of atoms in a unit cell is four (8×1/8 + 6×1/2 = 4). There are 26 metals that have the fcc lattice.
Generalic, Eni. "Rhombohedral lattice." CroatianEnglish Chemistry Dictionary & Glossary. 20 Oct. 2018. KTFSplit. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table