The term "World Union of Freethinkers" refers to a global organization that aims to promote independent thought and critical thinking. Some synonyms for this term might include "International Association of Rationalists," "Global Society of Skeptics," or "Worldwide Alliance of Secular Humanists." These words all point to the same underlying idea: the importance of questioning dogma and challenging authority in the pursuit of truth and individual freedom. Whether you call it freethinking, skepticism, or rationalism, the mission remains the same - to create a world where people are free to think for themselves, without fear of persecution or oppression, and to promote a society based on reason and logic.