I feel that the connotations of 'Terrorist' is awkward but I'll use it and see how it goes. Great idea, I felt that having them called 'Barbarians' past the Classical Age was pretty anachronistic.
How about changing the Industrial name to 'Anarchists'? It may fit better with the age.
The connotation that "terrorist" == evil; no questions asked, is certainly a strong one (at least for the West), but it is still the most accurate reflection of the barbarian player in-game, who, effectively, seeks to incite terror to achieve their end; which is an antithetical enough way of approaching a conflict in civilised society that they can still be considered "uncivilised." Because the game doesn't accomodate the sophisticated ends that RL terroritsts might have, they are left with the same goal as barbarians, and pirates, and brigands, et al; to stomp workers and pillage gold and to generally cause mayhem for no perceivable, in-game reason (unlike other civs, they don't play to "win," and unlike city-states, they don't seem concerned with just trying to survive). This does, however, mean the term "terrorist" can be used without guilt; probably more so than the word "barbarian" in the first place - although that only comes to mind because its so difficult to not think of cultures characterised as barbarians by the Romans and Greeks and Icelandics.
"Anarchist," on the other hand, limits itself to a select school of thought on the nature of the state and of society - too sophisticated a term to apply to a group of ubiquitious, gold-hungry, murderous, kidnapping soldiers whose only purpose is to attack other players, and probably too offensive to any with an anarchist philosophy (I would say that anarchists are more reasonable to deal with than those who use terror to get their way). Although I would just love to see a barbarian Proudhon just try and steal my Settler
As an aside, I was thinking about how Barbarian City-States could work; but it would require removing the warmonger penalty for taking their cities, I guess, which isn't really feasible. I just wanted an excuse to add more city-state types, which no one has done in a while (and not for BNW, AFAIK).
