# PYXIS Index

From Pyxis public wiki

A PYXIS index uniquely identifies a cell and cell resolution in a hexagon tessellated icosahedral Discrete Global Grid System.

Digits range from 0 through 6 inclusive, where zero denotes a Centroid Child and non-zero denotes a Vertex Child. (E.g. **0102**.)

Because a Vertex Parent has only a centroid child, non-zero digits cannot be adjacent. (I.e., **0123** is not a PYXIS index.)

On the Icosahedron, PYXIS indices are prefixed with a letter (A through T) or number (1 through 12) identifying the root cell. A letter denotes a face tessellation (i.e. hexagon) and a number denotes a vertex tessellation (i.e. pentagon). Such indices look like **A-040506** or **1-203**.