It's definitely more a "college level" term in the US, but very much undergrad, if that makes sense. Good chance someone who even minored in certain social science fields will know it (decent odds they'll have employed it on a written exam a time or three), plus most people who just have a hobby-level but long-running interest in those kinds of things. A good high school course might expose students to the term, but I doubt it's common, at least outside elite prep schools.