NON-REGULAR TESSELLATIONS are composed of shapes that are not regular polygons and do not have any restrictions on their arrangement around vertices.
There are an infinite number of non-regular tessellations.
Tessellations are often referred to as N-HEDRAL.
N referring to a number and hedral meaning shape.
A tessellation that uses one shape is considered monohedral, 2 different shapes = dihedral, three shapes = trihedral and so on.