Roman. Not Greek. But I have to say, I've _always_ hated how they initially called it "Eks" (long before release) and then moved to call it "ten". We've had this discussion over and over. It would have made _so_ much more sense to call it "Mac OS X (eks) 1.0", like they did with the first version of Mac OS X Server. By now, we'd be talking about Leopard: Mac OS X 5.0. Even the paying for the upgrades would have been easier to defend. But having the version number "10" twice in a product's name right next to each other, once in Roman, once in decimal numbers, is plain stupid in my view.