Over the past week I've been asked three times, by three different people, about the names used for screw heads. Oddly enough, the questioners were from totally different parts of the globe and don't know each other - at least as far as I know. It turns out that the same screw, and screw head, can have several different names, even in the same language, depending on the country and target application.
In researching, and answering, their questions I ran across this helpful and well writen Screw Head Chart by Zero Fasteners. It can't totally resolve the naming difference issues, but at least it was very useful in making sure that we were all describing the same thing.