I have used the search function, but either this question hasn't been asked before, or I just can't find it. The book I'm currently writing is a science fiction piece that takes place in a somewhat dystopian/orweillian future, wherein a United Nations type supranational governmental entity has global authority. I have actually mulled over the idea of calling this organization the "United Nations", but I can't find out whether or not there would be any trademark issues to worry about. A close second choice would be "United Earth", but I have seen that name used as backstory to several different franchises. Is there anyway to determine whether either of these names are actually trademarked, or whether they are open game. I understand that this may not seem like it should be as important as I am making it seem, but the interaction between this entity and those around it are actually fairly crucial to the plot line that I have developed. As always thanks for the help.