An OFO is a votive object which is pointed at the sky when prayers are offered. Presumably it boosts the signal of weak invocations. Think of it as a sort of remote control communication device for O.F.O.s — Omnipotent Flying Objects.
It looks a bit like a steampunk hairbrush made of brass — perfect not only for contacting Heaven but also for singing in front of the bathroom mirror.
Nowadays OFOs are coming back into fashion. But this time they are called ‘smartphones’. Buy the app from the Godchecker Store today!