fuzzy horizon

prebroadcast forward probability determines the likelihood of your node forwarding each prebroadcast that it receives. From this value, we can calculate how far we expect a prebroadcast to travel from your node, assuming that all nodes in the network have the same prebroadcast forward probability as your node.

for example, if all nodes in the network have a prebroadcast forward probability of 0.5, they will each forward roughly half of the prebroadcasts that they receive. We would expect a prebroadcast to make it about two hops from its sender in such a network. If the network-wide forward probability is 0.85, we would expect a prebroadcast to make it about seven hops from its sender.

the number of hops you can expect your prebroadcasts to travel is your fuzzy horizon. Nodes beyond your fuzzy horizon are unlikely to receive your prebroadcasts.