It is a square tiling with each edge chamfered into new hexagonal faces.
It can also be seen as the intersection of two truncated square tilings with offset positions.
And its appearance is similar to a truncated square tiling, except only half of the vertices have been truncated, leading to its descriptive name semitruncated square tiling.
[1] With large squares it has been called a Dijon tile pattern.
Lower symmetry forms are related to the cairo pentagonal tiling with axial edges expanded into rectangles.