Building up a triangular lattice
The triangular lattice is sometimes called hexagonal lattice, which may cause some confusion. It can be viewed as a skewed rectangular lattice. It surface density is
where is the distance between nodes of the lattice. The dual of this lattice is the honeycomb lattice.
![](/SklogWiki/images/thumb/5/56/Triangular_lattice.png/200px-Triangular_lattice.png)