A type of Reliable Broadcast that implements little guarantees on delivery order.
Example
A sends: m1, m2
B sends: m3
Node 1: m1, m3, m2
Node 2: m3, m1, m2
Effectively poses no guarantee on if multiple nodes try to broadcast. Just guarantees that m1 will arrive for every node before m2, but no guarantees between ordering of m1, m2 and m3 as they were sent by different nodes.