Happy to share a project I've been working for the last few months: A5, a global, equal-area, millimeter-accurate geospatial index. If you you've come across S2 or H3 in the past, it has much in common, except that it uses pentagons for the cell shapes, and the underlying platonic solid it is based on is a dodecahedron (rather than cube, or icosahedron as are commonly used).

There are a number of visual examples on the website to show how it works, along with example use cases.