Is H3 a Hexagonal System?

H3 is a mostly hexagonal system, except for the parts that are hexagonal. So squares, you can tile the world with them. It works out to project the world onto a cube and you subdivide everything with hexagons. Unfortunately, the math doesn't work out. The solution that H3 uses is we have 12 pentagons at every resolution of the grid. These pentagons were chosen to be placed into into water.