Heraclitus of Ephesus, a pre-Socratic Greek philosopher,was most famous for his insistence on ever-present change, or flux or becoming, as the characteristic feature of the world, as stated in the famous saying, "No man ever steps in the same river twice" as well as "Panta rhei", everything flows.
So this is where the acronym ROES (RObotics European Society) relies, since the greek word roes means exactly this: the flows (streams, protoka, pototsi, potoci, fluxuri, teče).