The 192 S2 cells that anchor every Axona pub/sub topic and nodeId. Hover the globe to see which cell a coordinate falls in; click a swatch in the legend to highlight all coordinates in that cell.
Every Axona nodeId starts with an 8-bit S2 prefix derived from the peer's lat/lng via Google's S2 cube projection. The prefix anchors pub/sub topics: K-closest routing for a publisher-keyed topic naturally finds peers in the publisher's region.
S2 projects the globe onto the six faces of a cube and partitions each face into 4×8 = 32 cells, giving 192 cells total. The quadratic ST transform keeps cell areas within ~1.4× of each other across the globe — no polar shrinkage. Byte values 0xC0–0xFF are reserved (192–255) for future system topics.