Tesselation created from at least two types of regular polygons.

- Not all arrangements of regular polygons create semi-regular tessellations.
- A semi-regular tessellation is uniform but not regular.

### Example

Among the eight possibilities of semi-regular tessellations, this example is characterized by the *n*-tuple (3, 3, 4, 3, 4). This *n*-tuple indicates, in the given order, the number of sides in each of the regular polygons that share the same vertex in the tessellation.

(3, 3, 4, 3, 4) : The regular polygons found in a clockwise direction about the vertex indicated by the black dot are a triangle (3), a triangle (3), a square (4), a triangle (3) and a square (4). The same applies to all the vertices of this tessellation.