The Kodan ball was a sphere formed by Pohatu Nuva's climbing claws. In shape and size, it resembled the sphere used in Metru Nui for the very earliest versions of Akilini, which led Turaga Onewa to suggest the name "Kodan ball" to Pohatu Nuva.
When joined together, Pohatu Nuva's climbing claws formed the legendary Kodan ball.
The original Akilini balls were also called Kodan balls.
Pohatu's Kodan ball was very finely balanced, so it could be better controlled than a boulder when kicked.